Add signed benchmarks

[mborland]

Closes: #165

[cppalliance-bot]

An automated preview of the documentation is available at https://166.int128.prtest3.cppalliance.org/libs/int128/doc/html/index.html

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.95%. Comparing base (f19c83b) to head (63fab3d).
Report is 20 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #166   +/-   ##
=======================================
  Coverage   98.95%   98.95%           
=======================================
  Files          28       28           
  Lines        4108     4108           
  Branches     1022     1022           
=======================================
  Hits         4065     4065           
  Misses         40       40           
  Partials        3        3           

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[mborland]

@sdarwin Which directory does the doc bot build out of? I'm setting the :imagesdir: in the asciidoc as though it building out of the doc/ folder which locally shows the images.

[sdarwin]

The working dir is BOOST_ROOT, since the script calls ./b2 . Then the library docs are found at libs/name/doc/

[cppalliance-bot]

An automated preview of the documentation is available at https://166.int128.prtest3.cppalliance.org/libs/int128/doc/html/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://166.int128.prtest3.cppalliance.org/libs/int128/doc/html/index.html