Removed compiler warnings.

Added new operators to be used with gcc 3.0.x
Update of query cache code.
Added semaphores for Windows (not yet in use)
Added pthread_mutex_trylock for windows.


Docs/manual.texi:
  Update of query cache info.
Docs/section.Comparisons.texi:
  Added indexing.
client/mysqlbinlog.cc:
  Removed compiler warnings.
client/mysqltest.c:
  Added enable_result_log/disable_result_log
include/config-win.h:
  Added support of semaphores on Windows.
include/my_pthread.h:
  Added pthread_mutex_trylock for windows.
include/my_sys.h:
  Cleanup
libmysql/libmysql.c:
  Fixed bug in mysql_use_result() (When reusing connections).
myisam/ft_boolean_search.c:
  Removed compiler warnings
myisam/ft_nlq_search.c:
  Removed compiler warnings
myisam/ft_update.c:
  Removed compiler warnings
mysql-test/r/query_cache.result:
  New tests
mysql-test/t/query_cache-master.opt:
  New tests
mysql-test/t/query_cache.test:
  New tests
mysys/Makefile.am:
  Added new operators to be used with gcc 3.0.x
sql/filesort.cc:
  Removed compiler warnings
sql/item_func.cc:
  Removed compiler warnings
sql/mysql_priv.h:
  Removed compiler warnings
sql/mysqld.cc:
  Update of query cache code.
sql/slave.cc:
  Removed compiler warnings.
  Code cleanup (Indentation)
sql/sql_cache.cc:
  Updated code
sql/sql_cache.h:
  Updated code
sql/sql_repl.cc:
  Removed compiler warnings
sql/sql_yacc.yy:
  Updated query cache

libmysql/libmysql.c

@@ -2397,6 +2397,8 @@ mysql_fetch_row(MYSQL_RES *res)
 	DBUG_PRINT("info",("end of data"));
 	res->eof=1;
 	res->handle->status=MYSQL_STATUS_READY;
+	/* Don't clear handle in mysql_free_results */
+	res->handle=0;
       }
     }
     DBUG_RETURN((MYSQL_ROW) NULL);