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.

And normalize some line endings

Use inline-block instead

Always show recent correspondence.
Show success and error messages at all appropriate times.

Closes #38