Bug #1070001 - Re-organize stylus

- Switched from @import to @require.
- Files should now require the files they need rather than relying on an @import in a different file.
- Files in /include should not generate output.
- Tried to break files in main into sensible smaller pieces.
Bug 1070001 - Re-org Stylus - Tags

All tags now use same class ".tags".

There is a modifying class ".tags-small" for the tags in the wiki footer.

There is a .tags_tagit file to extend this with over-rides for the jQuery UI plugin.

Things that are not tags (list of interests on profile page) no longer use the class ".tags".
Merge pull request #2777 from stephaniehobson/BUG-1070001-reorg-stylus-tags

Bug 1070001: Re-org Stylus - Tags