Programatically add PYTHONPATH=. as one of the first thing in the code

[dameyerdave]

Because mongoengine_migrate makemigrations is used in the scope of the current project (directory) it would make sense to add the current directory (.) to the PYTHONPATH. Otherwise I always get the error

mongoengine_migrate makemigrations -m models.data
...
ModuleNotFoundError: No module named 'models'

As a workaround I call it like this

PYTHONPATH=. mongoengine_migrate makemigrations -m models.data

[bdragon300]

Fixed in dev branch