[Bugfix - MED] Fixed the private messages reply button

Fixed an issue in which the avatar image falls down the qa-login-bar

Also set a readable default size and some more code formatting.

You wouldn’t believe how long it took to figure this one out.

Any users who ran the upgrade in the previous commit should delete the
fromhidden index and replace with separate indexes on the fromhidden
and tohidden fields.

The user is now able to configure the minimal size of the tags when dynamically scaling them.

The Apache workaround broke some edge cases on Nginx

And display of links on favorites main page

Includes sitemap plugin

Also create generic qa_db_selectspec_count function for modifying a
selectspec with COUNT(*).

Fixes #27.

Add selectspec for counting messages

First batch of tests, using PHPUnit to test string functions.

Deprecate duplicate post_avatar function

By default fall back to old table layout for compatibility.
Also, mark old ranking functions as deprecated.