added purge deprecated updates feature

included support to purge all deprecated updates from SUS
added button for update purge to webadmin
Revert "added purge deprecated updates feature"

This reverts commit afae439fc82e597272d76d770a1c93d0e42e3a9b.
added support to purge deprecated updates

included functions for purging of deprecated updates
added button to webadmin for purge function