Fixed taxonomy tabs, save button, and preview. APLQuery_mod fixes.

Fixed taxonomy tabs not displaying text by using the nice name if no
singular name was found. Fixed save button not updating (would keep
displaying 'Saving...'), and added the first ajax function to catch the
errors with an alert dialog. Fixed preview bug adding a null post id
with the dynamic settings.

Also, this lead to other major fixes left from apl_query_mod project.
Fixed List Count, which also change the post limit that would later be
implemented for pagination and there were changes to the total about of
posts queried each query string (with the amount of excluded posts
included to prevent flooding). The post exclude function is also
obsolete now that post_in IDs are filtered before the final query.
Fixed Delete Database setting not saving.

Fixed the Delete Database in general settings because a typo was
preventing it from saving the correct value.
Fixed Save Button enlarging per click.

Fixed Save Button enlarging every time the button was clicked.
Originally there was an issue with the jQuery UI Button not being able
to reserve/store the proper size, so a quick fixed was made at the time
to patch it up.
Changed jQuery UI CSS file location to HTTPS.

Changed jQuery UI CSS file location from Google's CDA to an HTTPS site
location. This is a possible fix for others not being able to load the
CSS files properly.
Updated Readme.

Changed Changelog, and added an upgrade notice for 0.3.b8.