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

support-files/compiler_warnings.supp

@@ -1,17 +1,49 @@
+integer.cpp: .*control reaches end of non-void function.*: 1288-1427
 DictTabInfo.cpp : .*invalid access to non-static.*
 DictTabInfo.cpp : .*macro was used incorrectly.*
-EventLogger.cpp : .*defined but not used.* : 916
-NdbSqlUtil.cpp : .*unused variable.* : 684 - 685
-DbdihMain.cpp : .*unused variable.* : 6666
-DbtcMain.cpp : .*unused variable.* : 6947
-DbtcMain.cpp : .*unused variable.* : 11870
-DbtupExecQuery.cpp : .*unused variable.* : 1449
-DbtupSystemRestart.cpp : .*unused variable.* : 95 - 96
-DbtupIndex.cpp : .*unused variable.* : 188 - 242
-ndbd_malloc.cpp : .*defined but not used.* : 25
-main.cpp : .*unused variable.* : 131 - 132
+DbdihMain.cpp : .*unused variable.* : 6666-7013
+DbtupExecQuery.cpp : .*unused variable.* : 1823
 kernel_types.h : .*only defines private constructors and has no friends.* : 51
 Dbtup.hpp:   .*only defines private constructors and has no friends.*
 diskpage.hpp:   .*only defines private constructors and has no friends.*
 tuppage.hpp:   .*only defines private constructors and has no friends.*
-NdbScanOperation.cpp: .*unused variable '__align'.* : 1192
+NdbScanOperation.cpp: .*unused variable '__align'.* : 1190-1200
+sql_yacc.cc : .*label 'yyerrlab1' defined but not used.*
+kernel_types.h : .*'struct Local_key' only defines private constructors and has no friends.*
+lgman.hpp : .*'struct Lgman::Buffer_idx' only defines private constructors and has no friends.*
+SchemaFile.hpp : .*'struct SchemaFile::TableEntry' only defines private constructors and has no friends.*
+sql_yacc.cc : .*switch statement contains 'default' but no 'case' labels.*
+
+#
+# Things that can be ignored in InnoDB
+#
+pars0grm.tab.c: .*'yyerrorlab' : unreferenced label.*
+_flex_tmp.c: .*not enough actual parameters for macro 'yywrap'.*
+
+#
+# bdb is not critical to keep up to date
+#
+.*/bdb/.* : .*discards qualifiers from pointer target type.*
+.*/bdb/.* : .*unused parameter.*
+.*/bdb/.* : .*may be used uninitialized.*
+.*/bdb/.* : .*empty body in an if-statement.*
+db_vrfy.c : .*comparison is always false due to limited range of data type.*
+
+#
+# Ignore all conversion warnings on windows 64
+# (Is safe as we are not yet supporting strings >= 2G)
+#
+.* : conversion from 'size_t' to .*int'.*
+.* : conversion from '__int64' to .*int'.*
+
+#
+# The following should be fixed by the ndb team
+#
+.*/ndb/.* : .*used uninitialized in this function.*
+
+#
+# Unexplanable (?) stuff
+#
+listener.cc : .*conversion from 'SOCKET' to 'int'.*
+net_serv.c : .*conversion from 'SOCKET' to 'int'.*
+mi_packrec.c : .*result of 32-bit shift implicitly converted to 64 bits.* : 567