Extend 'all' filter operator to select all source tiddlers
Fix for autosave

Re-introduces the “tw-auto-save-wiki” message. The previous approach of
automatically triggering autosave whenever a tiddler changed meant that
changing configuration changes in control panel was triggering an
autosave. Using the explicit message gives us better control of the
situations in which we’ll autosave.

Now we solve the earlier problem of there being outstanding tiddler
change events at the time that we process the “tw-auto-save-wiki” by
deferring the autosave until the outstanding change event comes in.
Docs update
Adjust sync filter to avoid bug with deletions

The `[is[tiddler]]` filter rejects deleted tiddlers, meaning that
deletions were not triggering the dirty state correctly.
Docs for auto save wiki message
Release note updates
Release note update
Obeisance to JSHint for core modules

There are still some warnings about making functions in a loop, but
I’ll fix those as a separate pull request because the fixes are more
than typographic errors.