Cleanup during review

Simple optimization for 2 argument usage to function of variable arguments
Fix stack overrun when using 1+1+1+1+1+1+1+....
Update crash-me results for 5.0
Don't call post_open if pre_open() fails (optimization)



sql-bench/limits/mysql-4.1.cfg:
  Rename: sql-bench/limits/mysql.cfg -> sql-bench/limits/mysql-4.1.cfg
libmysql/libmysql.c:
  More portable define
mysql-test/mysql-test-run.sh:
  Write also InnoDB warnings to warnings.log
mysql-test/t/type_newdecimal.test:
  Don't get errors if innodb is not defined
mysys/my_alloc.c:
  Cleanup comments
mysys/thr_lock.c:
  Cleanup comments
sql/item.h:
  Remove not needed initializer
sql/item_func.cc:
  Simple optimization for 2 argument usage to function of variable arguments
sql/mysql_priv.h:
  We use more stackspace with the introduction of int_op() etc.
  This change ensures we don't run out of stack when doing 1+1+1+1...
  (Tested on x86, 32 bit)
sql/sp_head.cc:
  Don't call post_open if pre_open() fails
sql/sp_rcontext.cc:
  More comments
  Change so that post_open() doesn't have to be called if pre_open() fails
sql/sql_parse.cc:
  Fold long lines
sql/sql_select.cc:
  Simple reorganization to reduce number of if's
  Ensure that table_map is updated for where clause (fixed warning from valgrind)

mysql-test/mysql-test-run.sh

@@ -887,7 +887,7 @@ report_stats () {
 
     found_error=0
     # Find errors
-    for i in "^Warning:" "^Error:" "^==.* at 0x"
+    for i in "^Warning:" "^Error:" "^==.* at 0x" "InnoDB: Warning"
     do
       if $GREP "$i" $MY_LOG_DIR/warnings.tmp >> $MY_LOG_DIR/warnings
       then