Setting the primary key TYPE in stories to bigint to match production db.

I'M NOT CREATING A MIGRATION BECAUSE THE CHANGE IS ALREADY IN PRODUCTION THE PRODUCTION DB AND ALTERING THE
STORIES TABLE WOULD TAKE A VERY LONGTIME. ALSO GENERATING A MIGRATION WOULD BE TIME CONSUMING DUE TO
DEPENDENT OBJECTS AND VIEWS.
Purge old  delta_query and parent_delta_query directives.
Switch from deprecated CachedSqlEntityProcessor to SqlEntityProcessor with SortedMapBackupCache
Revert "Setting the primary key TYPE in stories to bigint to match production db."

I realized that the type of stories_id in the production db was actually int instead of bigint so reverting.

This reverts commit f5f35d87ddc7854262b66dd6b72d53888c940974.
CAST from bigint to int to enable import of processed_stories.
Change the type of processed_stories.stories_id from bigint to int to match stories.stories_id
Get rid of CAST since the type of processed_stories.stories_id is now int.
Merge branch 'master' of github.com:berkmancenter/mediacloud
Add processed_stories_id to the schema.