Genealogical numbering system support

[divinity666]

Added support for the common genealogical numbering system of ancestors (ref. [https://en.wikipedia.org/wiki/Genealogical_numbering_systems]).

Numbering of individuals in the reports (especially the text reports) should be a common understandable system and not only an incrementing number system. This especially becomes obvious in trees where far away generations are no more filled with all ancestors. Anyway the numbering system proposed here also in this situation assures a reproducible numbering system if the same individual is tested.

[codecov]

Codecov Report

Merging #3297 into master will increase coverage by 0.08%.
The diff coverage is 90.00%.

@@             Coverage Diff              @@
##             master    #3297      +/-   ##
============================================
+ Coverage     23.58%   23.67%   +0.08%     
- Complexity    11912    11916       +4     
============================================
  Files           862      862              
  Lines         41757    41772      +15     
============================================
+ Hits           9848     9888      +40     
+ Misses        31909    31884      -25     

Impacted Files	Coverage Δ	Complexity Δ
app/Report/ReportParserGenerate.php	72.07% <90.00%> (+0.15%)	527.00 <1.00> (+4.00)
app/Report/ReportPdfFootnote.php	87.87% <0.00%> (+40.90%)	19.00% <0.00%> (ø%)

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[coveralls]

Coverage increased (+0.09%) to 21.611% when pulling fed3f73 on divinity666:master into ad1699c on fisharebest:master.

[arbor95]

This pull request is not implemented/accepted for more than 3 years and so I think it should be removed/closed.