Modify framebuffer and NGA framebuffer to read screen size from board model dtb file. Optimise memory usuage of frame buffer Add example minigui application with hooks to profiler (which writes results to S:\). Modified NGA framebuffer to run its own dfc queue at high priority

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# Used by test_doctest.py.

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class TwoNames:

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    '''f() and g() are two names for the same method'''

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    def f(self):

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        '''

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        >>> print TwoNames().f()

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        f

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        '''

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        return 'f'

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        g = f # define an alias for f