imlib2 bmp loader, but it was imcomplete compared to the bmp
standards, so i actually ended up reading the file format definitions
on line i could find and using lots of test images... wrote a new one.
you can at least view bmp files now. note - i found 1 bmp file that
claims to have an alpha channel (amask is non-empty) and then proceeds
to provide an image with pixels - all alpha 0. so its transparent when
it shouldnt be. beats me but looks like a broken bmp file to me when
it compes to specs.
SVN revision: 49324