The better implementation of a224297.
Fixes ability to reorder tag aliases, especially - the ability to change
the tag's primary name after it was created. Until now, both of these
scenarios needed sad workarounds on the user part.
Ignored only the rules about continuing / hanging indentation.
Also, added __init__.py to tests so that pylint discovers them. (I don't
buy pytest's BS about installing your package.)
For quite some time, I hated Falcon's class maps approach that caused
more chaos than good for Szurubooru. I've taken a look at the other
frameworks (hug, flask, etc) again, but they all looked too
bloated/over-engineered. I decided to just talk to WSGI myself.
Regex-based routing may not be the fastest in the world, but I'm fine
with response time of 10 ms for cached /posts.
