Refactor request: more informative variable/parameter/function names

[SKalt]

Working on #114, I've found myself wishing for more informative variable names. Here's a preliminary list of suggested refactors:

• changes.py:
  • statements_for_changes
    • things_from, things_target -> source_<type of source>, target_<type of target>
  • statements_from_differences
    • v -> what v is
• migra.py
  • Migration.__init__
    • x_from, x_target: -> source_<type of source>, target_<type of target>

[djrobstep]

Yeah, these admittedly aren't brilliant, but until recently have been for internal consumption only.

Need to think carefully about the before -> after naming in particular. Definitely want to standardize but I've had people complain before that the names I chose for these in various places were confusing to them.

[SKalt]

Yeah, these admittedly aren't brilliant, but until recently have been for internal consumption only.

completely understandable.

Need to think carefully about the before -> after naming in particular. Definitely want to standardize but I've had people complain before that the names I chose for these in various places were confusing to them.

No rush. I'm glad you got time to look at this issue!