Changed thd variables max_join_size and select_limit to type ha_rows.

This fixed some optimization problems when using -DBIG_TABLES
Portabilty fixes for OpenUnix and HPUX
Added C and C++ version numbers to mysqlbug


Docs/mysqld_error.txt:
  Added new error message
acinclude.m4:
  Fix for configure problem on OpenUnix
configure.in:
  Fix for OpenUnix
  Added C and C++ versions to mysqlbug
mysql-test/r/variables.result:
  Update of max_join_size handling
mysql-test/t/variables.test:
  Update of max_join_size handling
mysys/Makefile.am:
  Removed duplicate row
mysys/my_alloc.c:
  Safety fixes (not fatal)
scripts/Makefile.am:
  Added C and C++ compiler versions to mysqlbug
scripts/mysqlbug.sh:
  Added C and C++ compiler versions to mysqlbug
sql/item_func.cc:
  Fixed that user variables that changes are not threated as constants.
sql/item_func.h:
  Fixed that user variables that changes are not threated as constants.
sql/mysqld.cc:
  Changed thd variables max_join_size and select_limit to type ha_rows
sql/repl_failsafe.cc:
  Removed not needed cast
sql/set_var.cc:
  Changed thd variables max_join_size and select_limit to type ha_rows
sql/set_var.h:
  Changed thd variables max_join_size and select_limit to type ha_rows
sql/slave.cc:
  Removed not needed cast
sql/sql_class.h:
  Changed thd variables max_join_size and select_limit to type ha_rows
sql/sql_parse.cc:
  Removed not needed cast
  Fixed security problem with mysql_drop_db()
sql/sql_show.cc:
  Changed thd variables max_join_size and select_limit to type ha_rows
sql/structs.h:
  Changed thd variables max_join_size and select_limit to type ha_rows

scripts/mysqlbug.sh

@@ -231,6 +231,8 @@ ${ORGANIZATION- $ORGANIZATION_C}
 >Class:		$CLASS_C
 >Release:	mysql-${VERSION} ($COMPILATION_COMMENT)
 `test -n "$MYSQL_SERVER" && echo ">Server: $MYSQL_SERVER"`
+>C compiler:    @CC_VERSION@
+>C++ compiler:  @CXX_VERSION@
 >Environment:
 	$ENVIRONMENT_C
 `test -n "$SYSTEM"  && echo "System: $SYSTEM"`