Migrate memcache module to Drupal 6

Preliminary port of memcache module to drupal 6.

Initial testing indicates that it is working.

Quick list of what I did:

• Removed patches - drupal 6 has this in core
• Removed .install file. Probably should still be there to bring stuff forward though
• Updated memcache.inc - updated cache_set() call to match drupal 6
• Updated memcache_admin module. Kinda works now, needs a lot more love though

To be done:

• memcache.db.inc is untouched and needs updating
• memcache-session.inc is needs updating also

Otherwise it works and the modules appear to work also.

noticed the other ticket here: http://drupal.org/node/188474. oh well