- Fix MDEV-5393 and MDEV-5434. It is a major update of ODBC catalog tables

processing that takes care of:
  - Drastically reduce the amount of storge needed to process them.
  - Handle longjmp's.
  - Makes the line limit an opion (MAXRES)
  - Schema can also be specified with the DBNAME option.
  - Issue warnings on fetch errors or when result lines have been limited.
  - Change some column names to reflect ODBC version 3 standard.
  The documentation have been updated accordingly

modified:
  storage/connect/filamdbf.cpp
  storage/connect/ha_connect.cc
  storage/connect/myconn.cpp
  storage/connect/mysql-test/connect/r/odbc.result
  storage/connect/mysql-test/connect/r/odbc_postgresql.result
  storage/connect/mysql-test/connect/r/odbc_sqlite3.result
  storage/connect/mysql-test/connect/r/odbc_xls.result
  storage/connect/mysql-test/connect/r/xml.result
  storage/connect/mysql-test/connect/t/odbc_postgresql.test
  storage/connect/odbccat.h
  storage/connect/odbconn.cpp
  storage/connect/odbconn.h
  storage/connect/plgdbsem.h
  storage/connect/plgdbutl.cpp
  storage/connect/rcmsg.c
  storage/connect/tabfmt.cpp
  storage/connect/table.cpp
  storage/connect/tabodbc.cpp
  storage/connect/tabodbc.h
  storage/connect/tabutil.cpp
  storage/connect/tabwmi.cpp
  storage/connect/user_connect.cc
  storage/connect/valblk.cpp
  storage/connect/valblk.h
  storage/connect/value.cpp

storage/connect/tabutil.cpp

@@ -158,8 +158,9 @@ PQRYRES TabColumns(PGLOBAL g, THD *thd, const char *db,
   /**********************************************************************/
   /*  Allocate the structures used to refer to the result set.          */
   /**********************************************************************/
-  qrp = PlgAllocResult(g, ncol, n, IDS_COLUMNS + 3,
-                          buftyp, fldtyp, length, false, true);
+  if (!(qrp = PlgAllocResult(g, ncol, n, IDS_COLUMNS + 3,
+                             buftyp, fldtyp, length, false, true)))
+    return NULL;
 
   // Some columns must be renamed
   for (i = 0, crp = qrp->Colresp; crp; crp = crp->Next)