FIX avoid registering the same colormap twice to matplotlib #464
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Pycortex raises an error with matplotlib 3.6, when it tries to register the same colormap twice. This is because the check
if self.cmap not in cm.__dict__does not work anymore. (See recent changes to the colormaps API in matplotlib here)This PR:
get_cmapdictinDataviewandDataviewRGBI tested the fix with matplotlib 3.3 and 3.6.