exposing mapping_distance in travel builder

[knaaptime]

expose mapping_distance

this just allows you to pass a mapping_distance through to pandana's snapping mechanism but it induced some formatting changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.4%. Comparing base (8c0bc1f) to head (099bcfc).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #756     +/-   ##
=======================================
+ Coverage   85.3%   85.4%   +0.1%     
=======================================
  Files        149     150      +1     
  Lines      15914   15975     +61     
=======================================
+ Hits       13580   13641     +61     
  Misses      2334    2334             

Files	Coverage Δ
libpysal/graph/_network.py	100.0% <100.0%> (ø)
libpysal/graph/base.py	96.5% <100.0%> (+0.1%)	⬆️

... and 1 file with indirect coverage changes

[jGaboardi]

Did I jump the gun on merging #755 ?

[knaaptime]

not really i pushed this the instant you hit merge. I think this can just go in

[knaaptime]

and it switches the docstrings, which i think is more useful. The private funcs had the more descriptive docs last time

[martinfleis]

We should probably use intersphinx here to link to the class but that is a just a minor detail.