Set blog editing up for multi-record edit/submit

This was structured with one form per record. Now it is one form contains n records and they will all submit together.
make blog/dispatch edit save multiple records

This now save whatever records you've ajaxed in. Content and Image data can be edited. Later I may want to add ContentCollection.

This can probably be ported directly to newsfeeds and that's what I'll try next.
extend multi-record editing to newsfeed

With a few modifications to views, data fetches and js, I've got the editing working in both contexts.

The code match is so good, I expect adding ContentCollection into the Controller edit_dispatch() action and edit_dispatch.ctp should work fine for both.
eliminate Content.publish use

This marks the shift away from any use of Content level publish/hold indication. ContentCollection and Collection level filtering must carry the load.

Whether this took care of all problems, we'll find out in use. The field has been renamed but not removed. The pieces of code have been REM'd but not removed.