This commit brings many changes, in particular two important ones:

1) Support of partitioning by connect. A table can be partitioned
   by files, this is an enhanced MULTIPLE table. It can be also
   partitioned by sub-tables like TBL and this enables table sharding.
2) Handling a CONNECT bug that causes in some cases extraneous rows
   to remain in the table after an UPDATE or DELETE when the command
   uses indexing (for not fixed file tables). Until a real fix is
   done, CONNECT tries to ignore indexing and if it cannot do it
   abort the command with an error message.

- Add tests on partitioning
added:
  storage/connect/mysql-test/connect/r/part_file.result
  storage/connect/mysql-test/connect/r/part_table.result
  storage/connect/mysql-test/connect/t/part_file.test
  storage/connect/mysql-test/connect/t/part_table.test

- Temporary fix
modified:
  sql/sql_partition.cc

- Add partition support
modified:
  storage/connect/ha_connect.cc
  storage/connect/ha_connect.h
  storage/connect/reldef.cpp
  storage/connect/reldef.h
  storage/connect/tabdos.cpp

- Add functions ha_connect::IsUnique and ha_connect::CheckColumnList
modified:
  storage/connect/ha_connect.cc
  storage/connect/ha_connect.h

- Prevent updating a partition table column that is part of
  the partition function (outward tables only)
modified:
  storage/connect/ha_connect.cc

- Support INSERT/UPDATE/DELETE for PROXY tables
modified:
  storage/connect/tabutil.cpp

- Handle the bug on updating rows via indexing. Waiting for a real fix,
  Don't use indexing when possible else raise an error and abort.
modified:
  storage/connect/ha_connect.cc

- dbuserp->UseTemp set to TMP_AUTO
modified:
  storage/connect/connect.cc

- Add members nox, abort and only
modified:
  storage/connect/ha_connect.cc
  storage/connect/ha_connect.h

- Add arguments nox and abort to CntCloseTable
modified:
  storage/connect/connect.cc
  storage/connect/connect.h
  storage/connect/filamap.cpp
  storage/connect/filamap.h
  storage/connect/filamdbf.cpp
  storage/connect/filamdbf.h
  storage/connect/filamfix.cpp
  storage/connect/filamfix.h
  storage/connect/filamtxt.cpp
  storage/connect/filamtxt.h
  storage/connect/filamvct.cpp
  storage/connect/filamvct.h
  storage/connect/filamzip.cpp
  storage/connect/filamzip.h
  storage/connect/ha_connect.cc

- Add arguments abort to CloseTableFile and RenameTempFile
modified:
  storage/connect/filamap.cpp
  storage/connect/filamap.h
  storage/connect/filamdbf.cpp
  storage/connect/filamdbf.h
  storage/connect/filamfix.cpp
  storage/connect/filamfix.h
  storage/connect/filamtxt.cpp
  storage/connect/filamtxt.h
  storage/connect/filamvct.cpp
  storage/connect/filamvct.h
  storage/connect/filamzip.cpp
  storage/connect/filamzip.h
  storage/connect/tabdos.cpp
  storage/connect/tabdos.h
  storage/connect/tabvct.cpp
  storage/connect/xtable.h

- Fix info->records when file does not exists
modified:
  storage/connect/connect.cc

- Close XML table when opened for info
modified:
  storage/connect/connect.cc

- Add function VCTFAM::GetFileLength
modified:
  storage/connect/filamvct.cpp
  storage/connect/filamvct.h

- Column option DISTRIB -> ENUM
modified:
  storage/connect/ha_connect.cc

- Options connect, query_string and partname allways available
modified:
  storage/connect/ha_connect.cc

- Add function MYSQLC::GetTableSize
modified:
  storage/connect/myconn.cpp
  storage/connect/myconn.h

- Add new special columns (PARTNAME, FNAME, FPATH, FTYPE and FDISK)
modified:
  storage/connect/colblk.cpp
  storage/connect/colblk.h
  storage/connect/plgdbsem.h
  storage/connect/table.cpp

- Add function ExtractFromPath
modified:
  storage/connect/colblk.cpp
  storage/connect/plgdbsem.h
  storage/connect/plgdbutl.cpp

- Enhance Cardinality for some table types
modified:
  storage/connect/tabdos.cpp
  storage/connect/tabmysql.cpp
  storage/connect/tabmysql.h
  storage/connect/tabodbc.cpp
  storage/connect/tabodbc.h
  storage/connect/tabsys.cpp
  storage/connect/tabsys.h
  storage/connect/xindex.cpp
  storage/connect/xindex.h
  storage/connect/xtable.h

- Add test on special column
modified:
  storage/connect/tabfmt.cpp

- Add new files (added for block indexing)
modified:
  storage/connect/CMakeLists.txt

storage/connect/tabutil.cpp

@@ -425,7 +425,7 @@ PTDBASE TDBPRX::GetSubTable(PGLOBAL g, PTABLE tabp, bool b)
   if (mysql) {
 #if defined(MYSQL_SUPPORT)
     // Access sub-table via MySQL API
-    if (!(tdbp= cat->GetTable(g, tabp, MODE_READ, "MYPRX"))) {
+    if (!(tdbp= cat->GetTable(g, tabp, Mode, "MYPRX"))) {
       char buf[MAX_STR];
 
       strcpy(buf, g->Message);
@@ -437,6 +437,9 @@ PTDBASE TDBPRX::GetSubTable(PGLOBAL g, PTABLE tabp, bool b)
     if (db)
       ((PTDBMY)tdbp)->SetDatabase(tabp->GetQualifier());
 
+    if (Mode == MODE_UPDATE || Mode == MODE_DELETE)
+      tdbp->SetName(Name);      // For Make_Command
+
 #else   // !MYSQL_SUPPORT
       sprintf(g->Message, "%s.%s is not a CONNECT table",
                           db, tblp->Name);
@@ -480,7 +483,7 @@ bool TDBPRX::InitTable(PGLOBAL g)
     if (!(Tdbp = GetSubTable(g, ((PPRXDEF)To_Def)->Tablep)))
       return true;
 
-    Tdbp->SetMode(Mode);
+//  Tdbp->SetMode(Mode);
     } // endif Tdbp
 
   return false;
@@ -530,16 +533,12 @@ bool TDBPRX::OpenDB(PGLOBAL g)
 		return Tdbp->OpenDB(g);
     } // endif use
 
-  if (Mode == MODE_DELETE) {
-    /*******************************************************************/
-    /* Currently XCOL tables cannot be modified.                       */
-    /*******************************************************************/
-    strcpy(g->Message, "No DELETE for PROXY tables");
-    return true;
-    } // endif Mode
-
   if (InitTable(g))
     return true;
+  else if (Mode != MODE_READ && (Read_Only || Tdbp->IsReadOnly())) {
+    strcpy(g->Message, "Cannot modify a read only table");
+    return true;
+    } // endif tp
   
   /*********************************************************************/
   /*  Check and initialize the subtable columns.                       */
@@ -565,7 +564,8 @@ bool TDBPRX::OpenDB(PGLOBAL g)
       if (((PPRXCOL)cp)->Init(g, utp))
         return true;
 
-    } // endif MODE_UPDATE
+  } else if (Mode == MODE_DELETE)
+    Tdbp->SetNext(Next);
 
   /*********************************************************************/
   /*  Physically open the object table.                                */
@@ -573,6 +573,7 @@ bool TDBPRX::OpenDB(PGLOBAL g)
 	if (Tdbp->OpenDB(g))
 		return true;
 
+  Tdbp->SetNext(NULL);
   Use = USE_OPEN;
 	return false;
   } // end of OpenDB
@@ -593,8 +594,6 @@ int TDBPRX::ReadDB(PGLOBAL g)
 /***********************************************************************/
 int TDBPRX::WriteDB(PGLOBAL g)
   {
-//sprintf(g->Message, "%s tables are read only", To_Def->GetType());
-//return RC_FX;
   return Tdbp->WriteDB(g);
   } // end of WriteDB
 
@@ -603,9 +602,7 @@ int TDBPRX::WriteDB(PGLOBAL g)
 /***********************************************************************/
 int TDBPRX::DeleteDB(PGLOBAL g, int irc)
   {
-  sprintf(g->Message, "Delete not enabled for %s tables",
-                      To_Def->GetType());
-  return RC_FX;
+  return Tdbp->DeleteDB(g, irc);
   } // end of DeleteDB
 
 /***********************************************************************/