Made parsing of .cup files more generic regarding headers

[moldhouse]

I had problems parsing a cup file downloaded from SeeYou cloud as the header rwwidth was included. Parsing now ignores columns that are not specified instead of throwing an error.

Sorry for the double quotes, this is due to auto formatting with black.

[Turbo87]

looks like CI is unhappy about these changes 🙀

[Turbo87]

btw I'm fine with dropping support for older Python versions under a few minor conditions:

• it should be done in a dedicated PR
• we should mention it in the changelog
• it should be released as a new major version since it's a breaking change

[moldhouse]

Okay, I have started to add type annotations to parts of the code base so requiring python 3.6 would certainly be beneficial.

[lordfolken]

I think #217 tries to also implement rwwidth.

[bubeck]

Could you please change this PR, so that all changes of black are removed? Otherwise it is very hard to see, what you really have changed. Thanks!

[bubeck]

closed by https://github.com/Turbo87/aerofiles/pull/255