Fixed compiler warnings

Fixed compile-pentium64 scripts
Fixed wrong estimate of update_with_key_prefix in sql-bench
Merge bk-internal.mysql.com:/home/bk/mysql-5.1 into mysql.com:/home/my/mysql-5.1
Fixed unsafe define of uint4korr()
Fixed that --extern works with mysql-test-run.pl
Small trivial cleanups
This also fixes a bug in counting number of rows that are updated when we have many simultanous queries
Move all connection handling and command exectuion main loop from sql_parse.cc to sql_connection.cc
Split handle_one_connection() into reusable sub functions.
Split create_new_thread() into reusable sub functions.
Added thread_scheduler; Preliminary interface code for future thread_handling code.

Use 'my_thread_id' for internal thread id's
Make thr_alarm_kill() to depend on thread_id instead of thread
Make thr_abort_locks_for_thread() depend on thread_id instead of thread
In store_globals(), set my_thread_var->id to be thd->thread_id.
Use my_thread_var->id as basis for my_thread_name()
The above changes makes the connection we have between THD and threads more soft.

Added a lot of DBUG_PRINT() and DBUG_ASSERT() functions
Fixed compiler warnings
Fixed core dumps when running with --debug
Removed setting of signal masks (was never used)
Made event code call pthread_exit() (portability fix)
Fixed that event code doesn't call DBUG_xxx functions before my_thread_init() is called.
Made handling of thread_id and thd->variables.pseudo_thread_id uniform.
Removed one common 'not freed memory' warning from mysqltest
Fixed a couple of usage of not initialized warnings (unlikely cases)
Suppress compiler warnings from bdb and (for the moment) warnings from ndb

strings/ctype-ucs2.c

@@ -206,6 +206,7 @@ static int my_strnncoll_ucs2(CHARSET_INFO *cs,
   const uchar *se=s+slen;
   const uchar *te=t+tlen;
   MY_UNICASE_INFO **uni_plane= cs->caseinfo;
+  LINT_INIT(s_wc);
 
   while ( s < se && t < te )
   {
@@ -320,7 +321,8 @@ static int my_strncasecmp_ucs2(CHARSET_INFO *cs,
   const char *se=s+len;
   const char *te=t+len;
   MY_UNICASE_INFO **uni_plane= cs->caseinfo;
-  
+  LINT_INIT(s_wc);
+
   while ( s < se && t < te )
   {
     int plane;
@@ -1382,6 +1384,7 @@ int my_strnncoll_ucs2_bin(CHARSET_INFO *cs,
   my_wc_t s_wc,t_wc;
   const uchar *se=s+slen;
   const uchar *te=t+tlen;
+  LINT_INIT(s_wc);
 
   while ( s < se && t < te )
   {

strings/ctype-utf8.c

@@ -2312,6 +2312,7 @@ static int my_strnncoll_utf8(CHARSET_INFO *cs,
   const uchar *se=s+slen;
   const uchar *te=t+tlen;
   MY_UNICASE_INFO **uni_plane= cs->caseinfo;
+  LINT_INIT(s_wc);
 
   while ( s < se && t < te )
   {
@@ -2381,6 +2382,7 @@ static int my_strnncollsp_utf8(CHARSET_INFO *cs,
   my_wc_t s_wc,t_wc;
   const uchar *se= s+slen, *te= t+tlen;
   MY_UNICASE_INFO **uni_plane= cs->caseinfo;
+  LINT_INIT(s_wc);
 
 #ifndef VARCHAR_WITH_DIFF_ENDSPACE_ARE_DIFFERENT_FOR_UNIQUE
   diff_if_only_endspace_difference= 0;
@@ -4101,7 +4103,7 @@ my_wc_mb_filename(CHARSET_INFO *cs __attribute__((unused)),
   char hex[]= "0123456789abcdef";
   if (wc < 128 && filename_safe_char[wc])
   {
-    *s= wc;
+    *s= (uchar) wc;
     return 1;
   }
   

strings/decimal.c

@@ -1362,6 +1362,7 @@ int bin2decimal(char *from, decimal_t *to, int precision, int scale)
   {
     int i=dig2bytes[intg0x];
     dec1 x;
+    LINT_INIT(x);
     switch (i)
     {
       case 1: x=mi_sint1korr(from); break;
@@ -1403,6 +1404,7 @@ int bin2decimal(char *from, decimal_t *to, int precision, int scale)
   {
     int i=dig2bytes[frac0x];
     dec1 x;
+    LINT_INIT(x);
     switch (i)
     {
       case 1: x=mi_sint1korr(from); break;
@@ -1489,6 +1491,7 @@ decimal_round(decimal_t *from, decimal_t *to, int scale,
 
   sanity(to);
 
+  LINT_INIT(round_digit);
   switch (mode) {
   case HALF_UP:
   case HALF_EVEN:       round_digit=5; break;

strings/my_strchr.c

@@ -26,7 +26,7 @@
 #include "m_ctype.h"
 
 
-byte *my_strchr(CHARSET_INFO *cs, const char *str, const char *end,
+char *my_strchr(CHARSET_INFO *cs, const char *str, const char *end,
                 pchar c)
 {
   uint mbl;