urlparse1 maintenance

[mwhooker]

We include the source from cpython's urlparse module in order to avoid hacking up sys.modules as documented in 4f77827

I'd like to

• document why we did this
• write a test to prove this works well with urlparse (assuming that's why we did this)
• update urlparse1.py with latest version
• possibly roll this back if at all possible. I want to roll back b/c of code rot

cc @brainsik @glyphobet

[glyphobet]

I have no idea why this was done; best guess was that we were trying not to have urlparse in sys.modules when someone imports urlparse2, but I don't see why that would be a problem.

[brainsik]

So long ago. I don't remember either. Well perhaps you'll run into whatever problem it was we were working around. :-)