Clean up sys.path.append

[lintool]

We have a bunch of these idioms scattered throughout the code base:

import sys
sys.path.append('.')

Since our installation instructions suggest we do:

$ pip install -e .

These can be cleaned up?

[HAKSOAT]

Hi @lintool can I work on this? I think it's a good first task.

[lintool]

Sure! Any contributions welcome!

[lintool]

hi @HAKSOAT - if you're interested in helping out, there are other small tasks that we could use help on...

[HAKSOAT]

Hi @lintool Yes, I am very interested. I'd appreciate it if you fill me in.

[lintool]

Please ping me on email?

[HAKSOAT]

Your uwaterloo email right?

[lintool]

Yes please.

[HAKSOAT]

Done.