Various minor fixes/changes suggested by Thiseas and others

[nevrome]

Changes collected here:

• Made the display of description and source url in the explorer page of the of the server's html API indendent of each other.
• Made the source column hide when the necessary URL is missing on the archive page.
• Added a input validation feature that checks line endings of the first (!) row in text files in packages. Only runs when checksums are present, because only then a difference in line endings can lead to unexpected behaviour.
• Made it possible to give ORCIDs with --newContributors in rectify.
• Fixed encoding issues in trident list when additional .janno columns are requested.
• Nicer error messages in case of missing input files in validate.

[codecov]

Codecov Report

❌ Patch coverage is 75.26882% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.28%. Comparing base (e9a4f7c) to head (38d4045).
⚠️ Report is 13 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Poseidon/Core/ServerHTML.hs	0.00%	10 Missing ⚠️
src/Poseidon/Core/Utils.hs	58.82%	3 Missing and 4 partials ⚠️
src/Poseidon/CLI/Trident/List.hs	0.00%	2 Missing and 1 partial ⚠️
src/Poseidon/CLI/Trident/Serve.hs	50.00%	1 Missing ⚠️
src/Poseidon/Core/Contributor.hs	80.00%	0 Missing and 1 partial ⚠️
src/Poseidon/Core/Package.hs	97.91%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #396      +/-   ##
==========================================
+ Coverage   52.14%   52.28%   +0.14%     
==========================================
  Files          37       37              
  Lines        6012     6049      +37     
  Branches      643      648       +5     
==========================================
+ Hits         3135     3163      +28     
- Misses       2234     2238       +4     
- Partials      643      648       +5     

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[stschiff]

OK, went through this. Very nice! Thanks for fixing the nasty encoding bug in addCols. I had to drill a bit deeper to actually find it myself. I was very confused when List.hs had so few changes to it.