ID match skeleton maps

[pillswor]

Adjusted skeleton map in save_fits command to match to ID of filament+1 (i.e. filament 0 value in map is 1, etc...) for global filament-by-filament analysis post structure analysis.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.74%. Comparing base (aa03e4e) to head (f9be4e7).
⚠️ Report is 176 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (aa03e4e) and HEAD (f9be4e7). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (aa03e4e)	HEAD (f9be4e7)
	4	1

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #100      +/-   ##
==========================================
- Coverage   72.46%   64.74%   -7.72%     
==========================================
  Files          18       19       +1     
  Lines        3290     3435     +145     
==========================================
- Hits         2384     2224     -160     
- Misses        906     1211     +305     

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[e-koch]

thanks @pillswor!

codecov failure seems to be because it hadn't been running for some time and is unrelated to changes in this PR