Pcbnew: minor code cleanup and enhancement in zone filling. Commit patch from Marco Mattila. Eeschema: minor bug fix about dangling ends. removed obsolete file

Pcbnew: fix a serious bug in ZONE_CONTAINER::HitTestFilledArea( ) which could break connectivity calculations relative to copper areas.
Fix also very minor issues relative to copper zones.
Update boost::polygon from Boost svn repository.

Eeschema: fix bug in load_one_schematic_file.cpp: error about files version, that create errors for hierarchical labels.
Pcbnew: cleaning code in block.cpp, and modifye previous way to calculate block size in block command, because old way creates unexpected behavior in block rotate and block flip.
Pcbnew: Fix a bug in plot silkscreen layers.
Cvpcb: Fix compilation issue under MACOX

can be deleted later if they exist in the headers, or moved to 
headers if they should exist in the headers.

Eeschema: fix bug in algorithm which select net names, in netlist calculations. Named nets should now keep their names. Cvpcb:minor enhancements. Gerbview: fix an issue under W7.

Gerbview: remove useless calls to SetToolbar() which create horizontal toolbar flicker under Windows.

Gerbview: fix an issue with gerber files having a line comment starting by G04 and a command after this comment, on the same line.

Fix issue with new layer box, mainly with wxWidgets 2.9.1, minor code cleanup. Uncrustify class_layerchoicebox.cpp