make sanitize_doi() do a lot more to dois

[GlazerMann]

This time I made test first

[codecov]

Codecov Report

Merging #737 into master will decrease coverage by 0.86%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #737      +/-   ##
============================================
- Coverage     69.35%   68.49%   -0.87%     
- Complexity     1621     1634      +13     
============================================
  Files            12       12              
  Lines          3270     3314      +44     
============================================
+ Hits           2268     2270       +2     
- Misses         1002     1044      +42

Impacted Files	Coverage Δ	Complexity Δ
expandFns.php	90.97% <100%> (+0.97%)	0 <0> (ø)	⬇️
Template.php	73.84% <0%> (-2.25%)	1454% <0%> (+4%)
Comment.php	100% <0%> (ø)	12% <0%> (+8%)	⬆️
Page.php	74.64% <0%> (+1.28%)	71% <0%> (+1%)	⬆️
apiFunctions.php	70.02% <0%> (+1.98%)	0% <0%> (ø)	⬇️

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[ms609]

I feel like this duplicates code that already exists elsewhere – am I right? If so, is there a way to avoid the duplication?

[GlazerMann]

This code is duplicated in parts around the source base. By putting it all here, we do not need the other bits most likely. Those other parts are now fixed and use sanitize_doi().