Made CachePrune into a TimerTask daemon
Added relation between LastModified and Cache
Passing DAOs to LastModCheck instead of connection
Replaced Filter filter table operations with FilterDAO
Replaced cache operations in Filter with CacheCheck class
Changed cache downloaded field form byte to bit
Fixed DAO setup issues
Fixed potential issue with iterator

A blocked page that hs been updated will throw an exception.
Fixed handling of cache - lastmodified
Added prune Daemon for last modified entries
Re-enabled filter update button