Remove depreciated menu code, move del button

There's some really old code in here that's not being used anymore,
let's remove it and move the delete all items button to the bottom. Also
remove the Nominate This button. Resolves #368 and #336
Style newly placed delete button

last part of resolving 336
Add a sortable Last Retrieved column to the Subscribed Feeds table. See #343
Bad process for handling query strings fixed

Partially resolves #370
Pinking shears
Coding standards in slurp.php
Static 'status' property of Alert_Box must be called statically
Move import-cron.php functionality out of standalone file, and improve nonce logic
Remove debug cruft
Handle setting feeds to Alert with a error count

Only set to Alert status after 3 errors and check for a user setting
(not yet set). Towards #365
Move modules control to bottom

Resolves #364
Fixing Nonce, adding field

Towards #365
Allow user to set number of errors

Final point to resolve #365
Note resolution of #328
Get source title from parent, not post_meta

Towards resolving #339
Take external ids for getting source
switch to using the template tag for source title

Should resolve #339 #350
Make author visible in modal footer.

Resolves #357
Fixing variable call
Tools for building feed folders

Towards #345