-cleaned code trying to remove some overhead with memcache/redis, also fixed issues with debugger

-fixed CacheFlush  so it can work with cache groups

-fixed Cache method for accepting both key or group, so that a user can cache by group and also delete just a item of a group using the key

-users can chose to store session in group or not when caching, arguments: bool,
cache type, 'group:name', connection name, example: SessionStart(1, memcache,
'group:sessions',db1);

-improvement to methods set/get/delete so user can chose the cache type, example
set('redis',foo,bar,300)
get('redis',foo)
delete('redis',foo)

-added renumber method for helping to renumber tables that the autoincrement field lost continuity, usare renumber('table'), renumber('table','uid') where uid is the autoincrement name of the table