Gerbview: support for plot lines (currently: not arcs) with a rectangular pen (Yes, it exists!). pcbnew: try to fix an issue when exporting arcs in gencad.

Gerbview: Fixed compil problem in debug Mode. Pcbnew: try to fix an issue in export gencad  (incorrect rectangular pads)

Gerbview: Added support for gerber command   SR (Step and Repeat) and multiple MOIN and MOMM in file

Gerbview: added  support forSF  (scale factor), IO (Image Offset), OF (Offset) and MI (Mirror) commands.

Fixed a bug about Aperture Definition having parameters for an aperture macro. See Changlog for not yet supported RX274X commands. Having still problems with arcs in some gereber files.

* Changed wxPenStyle which is not define in wxWidgets 2.8 to int and
  renamed GRRect to prevent duplicate function definition in gr_basic.
* Add missing wxT() macros to strings in rs274x.cpp.

Some cleanup and fixes in gerbview. Cleanup gr_basic.* and added in gr_basic.* a minor modification coming from "EEschema selection.patch".

 Known bug: aperture macros having parameters are incorrect: parameters are not transmited correctly. Work still in progress.

Gerbview: fixed a bug when more than one layer loaded:  sometimes polygond were drawn in a bad color (including black, so sometimes polygons disappear)

Added hotkeys editor from David Turner, with a lot of enhancements and fixes
Added pins connections info in intermediate netlist for each compoment. This is redundant, but some netlist formats (ORCADPCB, PSPICE) are very easy to create with this redundant info.

minor code cleaning. fixed minor warnings in debug mode.