Retiring Josiah Carberry

[nevrome]

This solves #289 if merged. I applied the following changes:

• removed Josiah from newPackageTemplate, so that he doesn't get added any more to new packages created by init and forge - the contributor field is missing in the output of these commands now
• adjusted the golden test output accordingly, but also added Josiah to one of the test packages (test/testDat/testPackages/ancient/Schiffels_2016) to keep him around at least in one way and make sure that the ORCID parser runs in the tests
• added a new warning to the package reading process to point out an empty contributor field:

[Warning] Contributor missing in POSEIDON.yml file of package 2010_RasmussenNature-2.1.1

[nevrome]

If we go with this, then we probably have to increase the major version number. Removing Josiah could break workflows.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 62.50000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 68.15%. Comparing base (c4460ec) to head (97dec5c). Report is 4 commits behind head on master.

Files	Patch %	Lines
src/Poseidon/Package.hs	62.50%	2 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #293 +/- ## ========================================== - Coverage 68.22% 68.15% -0.07% ========================================== Files 26 26 Lines 3468 3470 +2 Branches 390 391 +1 ========================================== - Hits 2366 2365 -1 - Misses 712 714 +2 - Partials 390 391 +1 ```

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