Clear cache not working properly and prefixing not working properly.

I'm submitting a work-in-progress patch that takes care for several issues:
1) cache_clear_all was not working properly since it searched for $table instead of $bin
2) apc_handle_delete was not working properly as it was looking for a non-existant $data
3) apc_handle_key did not respect database prefixing, which is important
4) apc_get_lock was not doing anything usefull that i could imagine, correct me if I am wrong.

Please consider this a patch-needs-work as i am not a php coder and may have basic programming errors.

Personal note to Steve Rude, thanks for saving me alot of time with this module!