Multi: remove indentation tabs

[teknico]

Also remove trailing whitespace and add/remove empty lines at EOF, but only from files that had tabs removed anyway. Fixes #19.

Only whitespace changes intended, hopefully it's not breaking anything.

Sorry for the large diff, feel free to merge #7 and #18 first and I’ll rebase on top of their commits.

[buck54321]

Thanks for waiting, @teknico. Rebase when you get a chance.

[teknico]

Done, all tests still pass using both pytest and python3 -m unittest discover. {The former also suppresses stdout by default, which is nice.)

[JoeGruffins]

I got slightly different results with black:
https://github.com/teknico/tinydecred/compare/remove-tabs...JoeGruffins:compare?expand=1
But I still have syntax errors according to flake8:
https://github.com/JoeGruffins/tinydecred/commit/4c53eb2ddb1a76c7d0f2e3b556925bf6f12818dc/checks?check_suite_id=332569714

Was this done with flake8 or something else? BY HAND!??!$%#$

Yours has removed almost all of the tab errors, but I still see four in app.py

./app.py:91:8: W191 indentation contains tabs
./app.py:91:8: E101 indentation contains mixed spaces and tabs
./app.py:95:8: W191 indentation contains tabs
./app.py:95:8: E101 indentation contains mixed spaces and tabs

[teknico]

I got slightly different results with black

Black is not the right tool for this job because it does not remove all the tabs, and it also makes other changes that I didn't want; this PR is too large already.

But I still have syntax errors according to flake8

Which style changes to make, according to which tool, and how to configure it is best handled in another PR.

Was this done with flake8 or something else? BY HAND!??!$%#$

Flake8 only points out problems, it does not fix them. And well, not entirely by hand. 😉

The Midnight Commander editor usefully highlights tabs and trailing blanks: I used it to search and replace tabs in each file that had them, then used Sublime Text 3 only on those files to remove trailing blanks.

Yours has removed almost all of the tab errors, but I still see four in app.py

Good catch, thanks, fixing those too.

[JoeGruffins]

Looks good to me!

[buck54321]

Looks great.