Beta3 and release candidate

Here is beta3. We are almost done, so this is the release candidate.

• All known bugs are fixed.
• There are some improvements in CMYK interpolation, it is about 20% faster 
• jpgicc can now apply devicelinks without chrashing
• Matlab support is there!

Final release will follow in a month, so if you want to check the CMM in your application, now is a good time to do so. The code seems stable enough,  and you will catch small issues .