Capital format

[mborland]

Fixes and tests formatting of capitalized non-finite values

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.9%. Comparing base (7865b70) to head (38d91c4).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #781     +/-   ##
=========================================
+ Coverage     98.9%   98.9%   +0.1%     
=========================================
  Files          225     225             
  Lines        16915   16940     +25     
  Branches      1806    1806             
=========================================
+ Hits         16714   16740     +26     
+ Misses         201     200      -1     

Files with missing lines	Coverage Δ
include/boost/decimal/format.hpp	100.0% <ø> (ø)
test/test_format.cpp	100.0% <100.0%> (ø)

... and 1 file with indirect coverage changes

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