This is a major update of CONNECT that goes from version 1.1 to 1.2

===================================================================
- Implement a first support of the ALTER TABLE command. This fixes MDEV-5440
  but does much more than only that. See the details of how ALTER is supported
  in the new documentation and also in MDEV-5440 comment.
  This is done principally by implementing for CONNECT the virtual function
  check_if_supported_inplace_alter.
modified:
  storage/connect/connect.cc
  storage/connect/global.h
  storage/connect/ha_connect.cc
  storage/connect/ha_connect.h
  storage/connect/mysql-test/connect/r/bin.result
  storage/connect/mysql-test/connect/r/csv.result
  storage/connect/mysql-test/connect/r/dbf.result
  storage/connect/mysql-test/connect/r/dir.result
  storage/connect/mysql-test/connect/r/fix.result
  storage/connect/mysql-test/connect/r/index.result
  storage/connect/mysql-test/connect/r/ini.result
  storage/connect/mysql-test/connect/r/occur.result
  storage/connect/mysql-test/connect/r/pivot.result
  storage/connect/mysql-test/connect/r/vec.result
  storage/connect/mysql-test/connect/t/dbf.test
  storage/connect/plugutil.c
  storage/connect/user_connect.cc

- Fixes the tabname/table_name issue for XML tables. Implement
  multiple files XML tables.
modified:
  storage/connect/tabxml.cpp
  storage/connect/tabxml.h

- Set to varchar(256) the fields of catalog tables stored
  as STRBLK's (had length 0 --> CHAR(1))
  Add the GetCharString function to the VALBLK class
modified:
  storage/connect/ha_connect.cc
  storage/connect/valblk.cpp
  storage/connect/valblk.h
  storage/connect/value.cpp

- Translate CONNECT error messages to system_charset
  to avoid truncation on not ASCII characters.
modified:
  storage/connect/ha_connect.cc

- Update version number
modified:
  storage/connect/ha_connect.cc
  storage/connect/mysql-test/connect/r/xml.result

- Move the TDBASE::data_charset body from xtable.h to table.cpp.
  (dont' remember why)
modified:
  storage/connect/table.cpp
  storage/connect/xtable.h

- Other modifications are to enhance the support of OEM tables.
  In particular, they can now provide column definition in dicovery.
modified:
  storage/connect/colblk.h
  storage/connect/global.h
  storage/connect/ha_connect.cc
  storage/connect/mycat.cc
  storage/connect/plgcnx.h
  storage/connect/plgdbsem.h
  storage/connect/xtable.h

- Or to add or modify tracing.
modified:
  storage/connect/filamtxt.cpp
  storage/connect/ha_connect.cc
  storage/connect/plgdbutl.cpp
  storage/connect/tabfix.cpp
  storage/connect/tabmysql.cpp

storage/connect/tabxml.cpp

@@ -1,9 +1,9 @@
 /************* Tabxml C++ Program Source Code File (.CPP) **************/
 /* PROGRAM NAME: TABXML                                                */
 /* -------------                                                       */
-/*  Version 2.6                                                        */
+/*  Version 2.7                                                        */
 /*                                                                     */
-/*  Author Olivier BERTRAND          2007 - 2013                       */
+/*  Author Olivier BERTRAND          2007 - 2014                       */
 /*                                                                     */
 /*  This program are the XML tables classes using MS-DOM or libxml2.   */
 /***********************************************************************/
@@ -47,6 +47,7 @@
 #include "xindex.h"
 #include "plgxml.h"
 #include "tabxml.h"
+#include "tabmul.h"
 
 extern "C" {
 extern char version[];
@@ -136,7 +137,8 @@ bool XMLDEF::DefineAM(PGLOBAL g, LPCSTR am, int poff)
     } // endswitch typname
 
   Tabname = Cat->GetStringCatInfo(g, "Name", Name);  // Deprecated
-  Tabname = Cat->GetStringCatInfo(g, "Table_name", Tabname);
+  Tabname = Cat->GetStringCatInfo(g, "Table_name", Tabname); // Deprecated
+  Tabname = Cat->GetStringCatInfo(g, "Tabname", Tabname);
   Rowname = Cat->GetStringCatInfo(g, "Rownode", defrow);
   Colname = Cat->GetStringCatInfo(g, "Colnode", defcol);
   Mulnode = Cat->GetStringCatInfo(g, "Mulnode", "");
@@ -177,7 +179,12 @@ bool XMLDEF::DefineAM(PGLOBAL g, LPCSTR am, int poff)
 /***********************************************************************/
 PTDB XMLDEF::GetTable(PGLOBAL g, MODE m)
   {
-  return new(g) TDBXML(this);
+  PTDBASE tdbp = new(g) TDBXML(this);
+
+  if (Multiple)
+    tdbp = new(g) TDBMUL(tdbp);
+
+  return tdbp;
   } // end of GetTable
 
 /***********************************************************************/
@@ -245,6 +252,7 @@ TDBXML::TDBXML(PXMLDEF tdp) : TDBASE(tdp)
   Void = false;
   Usedom = tdp->Usedom;
   Header = tdp->Header;
+  Multiple = tdp->Multiple;
   Nrow = -1;
   Irow = Header - 1;
   Nsub = 0;
@@ -287,6 +295,7 @@ TDBXML::TDBXML(PTDBXML tdbp) : TDBASE(tdbp)
   Void = tdbp->Void;
   Usedom = tdbp->Usedom;
   Header = tdbp->Header;
+  Multiple = tdbp->Multiple;
   Nrow = tdbp->Nrow;
   Irow = tdbp->Irow;
   Nsub = tdbp->Nsub;
@@ -578,7 +587,7 @@ bool TDBXML::Initialize(PGLOBAL g)
 #endif
   } // end of try-catches
 
-  if (Root && Columns && !Nodedone) {
+  if (Root && Columns && (Multiple || !Nodedone)) {
     // Allocate class nodes to avoid dynamic allocation
     for (colp = (PXMLCOL)Columns; colp; colp = (PXMLCOL)colp->GetNext())
       if (!colp->IsSpecial())            // Not a pseudo column
@@ -671,7 +680,10 @@ void TDBXML::SetNodeAttr(PGLOBAL g, char *attr, PXNODE node)
 int TDBXML::Cardinality(PGLOBAL g)
   {
   if (!g)
-    return (Xpand || Coltype == 2) ? 0 : 1;
+    return (Multiple || Xpand || Coltype == 2) ? 0 : 1;
+
+  if (Multiple)
+    return 10;
 
   if (Nrow < 0)
     if (Initialize(g))
@@ -685,8 +697,13 @@ int TDBXML::Cardinality(PGLOBAL g)
 /***********************************************************************/
 int TDBXML::GetMaxSize(PGLOBAL g)
   {
-  if (MaxSize < 0)
-    MaxSize = Cardinality(g) * ((Xpand) ? Limit : 1);
+  if (MaxSize < 0) {
+    if (!Multiple)
+      MaxSize = Cardinality(g) * ((Xpand) ? Limit : 1);
+    else
+      MaxSize = 10;
+
+  } // endif MaxSize
 
   return MaxSize;
   } // end of GetMaxSize
@@ -952,6 +969,34 @@ void TDBXML::CloseDB(PGLOBAL g)
     Docp->CloseDoc(g, To_Xb);
     } // endif docp
 
+  if (Multiple) {
+    // Reset all constants to start a new parse
+    Docp = NULL;
+    Root = NULL;
+    Curp = NULL;
+    DBnode = NULL;
+    TabNode = NULL;
+    RowNode = NULL;
+    ColNode = NULL;
+    Nlist = NULL;
+    Clist = NULL;
+    To_Xb = NULL;
+    Colp = NULL;
+    Changed = false;
+    Checked = false;
+    NextSame = false;
+    NewRow = false;
+    Hasnod = false;
+    Write = false;
+//  Bufdone = false;
+    Nodedone = false;
+    Void = false;
+    Nrow = -1;
+    Irow = Header - 1;
+    Nsub = 0;
+    N = 0;
+    } // endif Multiple
+
   } // end of CloseDB
 
 // ------------------------ XMLCOL functions ----------------------------