Dissolve now outputs, normally, to a vector of the original geometry, or, in case of a multi, to its single type. Like union and intersection
Implemented multi_dissolve for not-connected linestrings
Fixed some accidental tabs from testcases
[SVN r61036]
Added test for remove_spikes
Small changes in tests for differences, sectionalize
Enhanced write_svg in the sense that .x()/.y() are removed, plus using max to avoid empty nonvisible boxes
[SVN r61020]
