Stop pirating BioSymbols

[jakobnissen]

BioSequences pirated BioSymbols by overloading gap, isambigous, isgap and iscertain. Remove these overloads.

This is a draft because it depends on a yet-unreleased version of BioSymbols.

[codecov]

Codecov Report

Base: 88.49% // Head: 88.53% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (2366628) compared to base (e4c8997).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #259      +/-   ##
==========================================
+ Coverage   88.49%   88.53%   +0.03%     
==========================================
  Files          31       31              
  Lines        2330     2329       -1     
==========================================
  Hits         2062     2062              
+ Misses        268      267       -1     

Flag	Coverage Δ
unittests	88.53% <100.00%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/BioSequences.jl	100.00% <ø> (+5.55%)	⬆️
src/biosequence/counting.jl	96.55% <100.00%> (ø)
src/longsequences/counting.jl	100.00% <100.00%> (ø)

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