WIP: make sign name flag turn into command line argument

[alessio]

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.
• Wrote tests
• Updated relevant documentation (docs/)
• Added entries in PENDING.md with issue #
• rereviewed Files changed in the github PR explorer

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For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #3309 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #3309   +/-   ##
========================================
  Coverage    55.65%   55.65%           
========================================
  Files          134      134           
  Lines         9716     9716           
========================================
  Hits          5407     5407           
  Misses        3965     3965           
  Partials       344      344