Try and optimize small integer powers.

[jzmaddock]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.1%. Comparing base (ad1ee2a) to head (d606acf).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #649     +/-   ##
=========================================
+ Coverage     94.1%   94.1%   +0.1%     
=========================================
  Files          279     279             
  Lines        28885   28903     +18     
=========================================
+ Hits         27161   27179     +18     
  Misses        1724    1724             

Files with missing lines	Coverage Δ
...lude/boost/multiprecision/detail/functions/pow.hpp	93.0% <100.0%> (+0.3%)	⬆️

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[ckormanyos]

Thank you John!

[cosurgi]

Hi John (@jzmaddock), if it's possible please add a default: case which does nothing. I am compiling YADE with flags (among others) -Werror -Wswitch-default. This will produce a compilation error when default: is missing