[set ops] remove #ifdef/#endif block used for debugging
[set ops] polish/simplify follow L/L code; change some vairable names that are confusing;
[test][algorithms][set ops] replace BOOST_CHECK by BOOST_CHECK_MESSAGE and in case of error output the two geometries, the expected and the computed results
Merge pull request #10 from mkaravel/feature/point_iterator

[point iterator] use the unit test framework library in unit tests
Merge pull request #11 from mkaravel/feature/setops

Feature/setops
[set ops] polish code and use std::find_if (suggestions by Adam);
Merge pull request #12 from mkaravel/feature/setops

[set ops] polish code and use std::find_if (suggestions by Adam);