OI Safe: large patch, added Search activty, completely redid autolock,

OI Safe: large patch, added Search activty, completely redid autolock,
added preference 'Lock on screen lock' with default of true.
autlock is no longer dependent upon CategoryList, which if not
active would cause app to go unlocked.  Instead each and every
activity listens for the broadcast from the service to know to
autolock.  None of the activities finish() upon lock but instead
launch FrontDoor to present user with AskPassword.  Upon unlock
the user is dropped right back where they left off.

Started using Android 1.5 features like onUserInteraction() which allows
the user to do anything with the app and cause a reset of the timer.
OI Safe now requires 1.5 as a result.

git-svn-id: http://openintents.googlecode.com/svn/trunk/Safe@2293 72b678ce-9140-0410-bee8-679b907dd61a