[distance] re-factor segment-box code
[distance] eliminate more useless code in segment-box computation
[distance][segment-box] qualify all calls to get<I> with the geometry namespace
[distance][segment-box] eliminate unused variable (pp_strategy) in method call;
initialize result with 0;
Merge branch 'develop' of https://github.com/boostorg/geometry into feature/distance
Merge pull request #36 from mkaravel/feature/distance

Feature/distance