Make trial able to run tests and modules in a specific order

[amacleod]

When trying to track down some side-effects issues between test modules run by trial, I found myself wishing I could specify the order in which to run modules.

For instance, if I issued the command:

trial tests/test_monkey.py tests/test_uncle.py

I would like it to run the monkey tests first and then the uncle tests.

Even more whiz-bang would be a way to specify the order when running all test_ modules in a directory, with possible choices being alphabetical, by modification time, or random.

[glyph]

I could have sworn this was a duplicate of something, but I just looked for like an hour and couldn't find it. If not, this should definitely be fixed. I've had this problem myself.

[jml]

Really, this is "parametrize the loader from the command line".

[glyph]

#3249 was filed as a duplicate of this.

[Screwtape]

This is a duplicate of #1948 (thanks to PovAddict on #twisted for pointing it out)