Specialize residue names

[timholy]

If you've added hydrogens to a structure, this supports the full information present in the residuedata tables imported from ff19SB:

• renames HIS to one of HID/HIE/HIP (using the protonation state from the added hydrogens)
• renames the amino- and carboxyl-terminal residues by prepending N/C

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.15%. Comparing base (98bfd75) to head (f548ea1).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/model.jl	85.71%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #80      +/-   ##
==========================================
- Coverage   95.28%   95.15%   -0.13%     
==========================================
  Files          14       14              
  Lines        2141     2169      +28     
==========================================
+ Hits         2040     2064      +24     
- Misses        101      105       +4     

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[timholy]

Let me know if there's some better place to put this new test file.

[jgreener64]

Great, just one comment then feel free to merge.

I will tag a release after merge.

[timholy]

Should I move the data file to https://github.com/BioJulia/BioFmtSpecimens?

[jgreener64]

You could if it provides a useful general case, but I'm not sure it's worth the effort.

[jgreener64]

Just to let you know, I renamed the function to specializeresnames! to match the lack of underscores in the rest of the package. It's not a change I like, but I think consistency is best (I would do it differently if I started again today).