* pipi.h: rename RGBA32 and BGR24 into RGBA_C and BGR_C.
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library, so we can have several or none of them at some time.
* sdl.c imlib.c: allow to save images that weren't created using the
current codec.
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colour spaces for a given image. For instance, if pipi_gaussian_blur is
applied to a 32-bpp image, it is automatically converted to gamma-corrected
32-bit floats beforehands, then converted back to normal.
* TODO: clipping, regions of interest, more formats, getpixel macros...
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sam