Pcbnew: fix  compil warning and a minor bug in plot negative (frame fer plotted in white therefore not visible).
minor code cleaning

pcbnew scripting: cleanup, renamed KICAD_SCRIPTING_EXPERIMENT to KICAD_SCRIPTING_WXPYTHON, now every flavour compiles

Footprint wizard converts from user units to internal units back and forth, so user can type in mm or mils now

* Footprint wizard C++ generic classes
* Footprint wizard C++ to python wrappers 
* Automatic plugin loader from ~/.kicad/plugins
* Python plugin architecture: Footprint wizards

detect building status of the swig .py file (on parallel make builds). Fix unit conversion returns (From_xxx) to integer, what's all the wxPoint/wxRect/wx.. expect. Extended createPcb.py example

Fixed wxSize bug, wxPoint(double,double) support, units. Fixed GetBoard wasn't accessible at every build. Extended example for board creation (now adds pads). Also fixed the _pcbnew loading from pcbnew which should only go to the internal _pcbnew and not the _pcbnew.so/dso. Right installation path for _pcbnew.so (in linux only)

BOARD::Add now it's wrapped in python and clears the .thisown flag on python to avoid GC from deleting the object later (BOARD will do)

* dlist.i empty list fixed (Segfault)
* units.i: FromMM FromMils ToMM ToMils
* added a little example (listPcb.py) that shows most items in a board

DLIST iterator code, now we can do:

    for module in pcb.m_Modules:
    	print module.GetReference()

instead of:

    module = pcb.m_Modules

    while module:
	print module.GetReference()
	module = module.Next()

or even:
    module_list = list(pcb.m_Modules)

* Added a first test 'testLoadSave.py'

CMakeLists.txt options to build scripting or scripting modules