Merge pull request #4 from psteinhoff/image_processing

Image processing
highpass moved to image_processing.c from segmentation.c
high pass accepts and returns only the images (no file names, obsolete flags, etc.)
Merge pull request #5 from alexlib/add_highpass

highpass moved to image_processing.c from segmentation.c
added test_highpass that fails - we need to test unsharp_mask first
Merge branch 'add_highpass' into image_processing
removed imx from copy_images
modified Cython bindings to simplify calls from Python, only original image and necessary parameters are supplied, the output is returned
added bindings for high pass, not yet working
removed imy from call to lowpass_n which is not necessary, like in other functions, imy = imgsize/imx;
added python bindings up to high pass, which still fails
TODO: filter_3 seems to be wrong
Python bindings for enhance, histeq, highpass, filter_3, etc.
renamed alex_lowpass_3 to lowpass_3_cb, including tests and Cython bindings
Merge branch 'image_processing' of https://github.com/alexlib/openptv into image_processing

Conflicts:
	liboptv/src/image_processing.c