Ballot Measures (single column) added

[stratofax]

Today's single-precinct ballot includes:

• Correct voting instructions for both plurality and "n of m" candidate contests
• Party abbreviations, below candidate names, where available
• Ballot measures in a single column layout
• Minor layout and spacing improvements

The ballot was generated with the command:

ballotmaker demo

All automated tests (pytest and linting on Python 3.8, 3.9 and 3.10 on Mac, Windows, and Linux) pass -- that's 9 total automated tests, all green on my fork. Ready to merge!

[ion-oset]

@stratofax the tests GitHub actions started have been running for several hours. I'm assuming they are blocked or caught in a loop. I've tried running them locally and they do the same thing. The test that hangs is this test_demo. I'm seeing similar results when I run ballotmaker demo directly.

Edit: Found the immediate issue, though not the ultimate cause. This code is in an infinite loop because path_finder has reached the filesystem root, and the parent of / is itself.

    while path_finder.name != self.package_name:
        path_finder = path_finder.parent

Note: I cancelled the build tasks.

[stratofax]

@ion-oset I'd like to merge this onto main before I add any more code. Thanks again for your excellent and careful review.

[ion-oset]

Minor comments added since you merged. They are mostly informational, so I'm posting them anyway.