Merge with MySQL 5.1, with following additions:

- Moved some code from innodb_plugin to xtradb, to ensure that all tests runs
- Did changes in pbxt and maria storage engines becasue of changes in thd->query
- Reverted wrong code in sql_table.cc for how ROW_FORMAT is used.

This is a re-commit of Monty's merge to eliminate an extra commit from
MySQL-5.1.42 that was accidentally included in the merge.

This is a merge of the MySQL 5.1.41 clone-off (clone-5.1.41-build). In
case there are any extra changes done before final MySQL 5.1.41
release, these will need to be merged later before MariaDB 5.1.41
release.

strings/ctype-simple.c

@@ -185,8 +185,8 @@ int my_strnncollsp_simple(CHARSET_INFO * cs, const uchar *a, size_t a_length,
     }
     for (end= a + a_length-length; a < end ; a++)
     {
-      if (map[*a] != ' ')
-	return (map[*a] < ' ') ? -swap : swap;
+      if (map[*a] != map[' '])
+	return (map[*a] < map[' ']) ? -swap : swap;
     }
   }
   return res;

strings/ctype-uca.c

@@ -7858,6 +7858,9 @@ static my_bool create_tailoring(CHARSET_INFO *cs, void *(*alloc)(size_t))
     return 1;
   }
   
+  if (!cs->caseinfo)
+    cs->caseinfo= my_unicase_default;
+  
   if (!(newweights= (uint16**) (*alloc)(256*sizeof(uint16*))))
     return 1;
   bzero(newweights, 256*sizeof(uint16*));