feat: support for alternative location of DLKcat in/output

[edkerk]

Main improvements in this PR:

• Features:
  • runDLKcat support alternative paths and names of the DLKcat.tsv file. (solves runDLKcat(): use DLKcat.tsv in a different directory #392)

Instructions on merging this PR:

• This PR has develop as target branch, and will be resolved with a squash-merge.
• This PR has main as target branch, and will be resolved with a merge commit.

[github-actions]

This PR has been automatically tested with GH Actions. Here is the output of the tests:

 
GECKO installed, unknown version (cannot find version.txt).
Running geckoCoreFunctionTests
Done geckoCoreFunctionTests
__________

Note: In the case of multiple test runs, this post will be edited.