Slow query log to file now displays queries with microsecond precission

--long-query-time is now given in seconds with microseconds as decimals
--min_examined_row_limit added for slow query log
long_query_time user variable is now double with 6 decimals
Added functions to get time in microseconds
Added faster time() functions for system that has gethrtime()  (Solaris)
We now do less time() calls.
Added field->in_read_set() and field->in_write_set() for easier field manipulation by handlers
set_var.cc and my_getopt() can now handle DOUBLE variables.
All time() calls changed to my_time()
my_time() now does retry's if time() call fails.
Added debug function for stopping in mysql_admin_table() when tables are locked
Some trivial function and struct variable renames to avoid merge errors.
Fixed compiler warnings
Initialization of some time variables on windows moved to my_init()

sql/sql_cache.h

@@ -142,6 +142,7 @@ struct Query_cache_query
   uint8 tbls_type;
   unsigned int last_pkt_nr;
 
+  Query_cache_query() {}                      /* Remove gcc warning */
   inline void init_n_lock();
   void unlock_n_destroy();
   inline ulonglong found_rows()		   { return limit_found_rows; }