BitsPlusPlus: Matlab specific fixes for Bits#, cleanups.

Some tiny incompatibility between Octave and Matlab fixed.
Some fixes for warnings. Some cleanups of comments. Some
additions to help texts.

Tested and confirmed to work on OSX 10.7.5 with 64-Bit Matlab R2012a.

OSX 10.7.5 with the NVidia GeForce GT 330M has a really screwed
gamma table on OSX! None of our detected LUT's or any of the manually
selectable LUT's work at all. They don't provide an identity mapping
and they additionally cause massive interference by dithering.

The same hardware under Ubuntu Linux 12.10 just worked out of the box (tm).

Tweaking with dithering interference can take very long. It took over
11 Minutes to converge to a solution with the Bits#.