added tests for three different filter kernels all 3 x 3 using test_filter_3
removed print line
added test for corrupted file with fallback to 1/9 3 x 3 filter
added info about edges in the filter_3
added one high pass filter test to test_filter_3
added histeq after unsatisfactory results from enhance which is for smaller than 512 images give strange results
fixed the test of enhance to use also histeq and both pass, though results of enhance are strange for small images
fixed the equal size bug
changed the test to verify we get 255 - some round-error in the constant
added comment to split function - would be removed in the next commit
removed obsolete split function
Merge branch 'image_processing' of https://github.com/alexlib/openptv into alexlib-image_processing

Conflicts:
	liboptv/src/image_processing.c
Merge pull request #9 from psteinhoff/alexlib-image_processing

Alexlib image processing