Adaptions to test with respect to new namespace model
Removed GMP/CLN and, where it was present, replaced by TTMATH
Small fix in comparable_distance test
All testfiles use bg as alias now
[SVN r66811]
added distance checks
added mpl assertions
added intersection segment/box
renamed "segment_iterator" to "segment_returning_iterator" to be able to reuse that name later on
[SVN r64505]