Plot option in GERBER format Plot (Exclude Edge Pcb layer) modification (now, default = off, and saved in config)

* fixed a bug in hierarchal shematics where a loop (e.g. same file included at different points in the 
hierarchy)  would cause infinite memory use.   
* added a edit footprint hotkey to eeschema, since it seems I'm always editing '0603' '0402' etc. on the 
common components, and it was difficult to edit this information before.

solved drc.cpp error (pcbnew crashes in track creation or edition). very minor other changes (translation)

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