Workarounded SWIG problems (does not support nested C++ classes, more on the subject: http://www.swig.org/Doc1.3/SWIGPlus.html#SWIGPlus_nested_classes).
Fixed erroneous hit testing for polygons in ratsnest for GAL.
Changed cast from float to double in RN_POLY::HitTest.
Pcbnew: GAL canvas selection tool bug fixes.

* Fix Python scripting error causing pcbnew_wrap.cxx to fail to build.
* Fix OpenGL canvas ratsnest missing connections in copper zones.