in you could see that some of the pixels which are inside the rectangle were
outside the overlay.  Specifically, the right column and bottom row was outside
the overlay rectangle.  This has been fixed.  Now all pixels which are supposed
to be part of a rectangle are drawn as being inside the overlay rectangle.

type of scalar used to store the sums.

compile in more contexts.

grid.  So now you can convert from image to hog instead of just hog to image.  Also added some
related unit tests.

--HG--
rename : tools/imglab/src/convert_pascal_voc.h => tools/imglab/src/convert_pascal_xml.h

--HG--
rename : tools/imglab/src/convert_pascal_voc.cpp => tools/imglab/src/convert_pascal_xml.cpp

imglab annotation format.

I did this because png.h will cause the compile to fail if the user #includes setjmp.h
along with png.h.