1. bug_fix_db.js: New script to remove leaks (statistics and community subscribers) from db for 2 deleted communities.
2. CommunityController.java: When updating a community, update 'pid' field in statistics and community subscribers related to this community.
3. PageHelpContentController.java: Revert previous commit - in function 'insertPageHelpContent()' always give pagehelpcontent parameter with community pid and replace it with id there.