Split highfive/boost.hpp.

[1uc]

Allowing more precise control over which parts of
boost need to be available.

[codecov]

Codecov Report

Attention: Patch coverage is 89.53488% with 9 lines in your changes missing coverage. Please review.

Project coverage is 87.12%. Comparing base (c890ad4) to head (8f1d3e4).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
include/highfive/boost_ublas.hpp	84.84%	5 Missing ⚠️
include/highfive/boost_multi_array.hpp	92.45%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1067      +/-   ##
==========================================
- Coverage   87.13%   87.12%   -0.01%     
==========================================
  Files         101      102       +1     
  Lines        6123     6122       -1     
==========================================
- Hits         5335     5334       -1     
  Misses        788      788              

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