Finish decimal128_fast

[mborland]

Closes: #645
Closes: #651
Closes: #652

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.5%. Comparing base (00cd5ea) to head (7170194).

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #654     +/-   ##
=========================================
+ Coverage     98.5%   98.5%   +0.1%     
=========================================
  Files          221     221             
  Lines        15681   15692     +11     
  Branches      1724    1724             
=========================================
+ Hits         15444   15455     +11     
  Misses         237     237             

Files	Coverage Δ
include/boost/decimal/bid_conversion.hpp	100.0% <100.0%> (ø)
include/boost/decimal/cmath.hpp	100.0% <ø> (ø)
include/boost/decimal/cstdlib.hpp	98.0% <ø> (ø)
include/boost/decimal/decimal128_fast.hpp	97.7% <ø> (ø)
include/boost/decimal/hash.hpp	100.0% <ø> (ø)
test/test_bid_conversions.cpp	100.0% <100.0%> (ø)

... and 1 file with indirect coverage changes

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