added optimizer to deps. Registration progress.

Added cppConvexOptimizer repository to deps. Need to create wscript
connection.

Made some progress on the derivative and value calculation for
correlation coefficient based rigid registration. May need to move stuff
to a class.

Moved linearRotate from testing file to ndarray_utils.

Made doxygen paths relative
added optimizer to wscript and added first groups to doxgyen
Renamed OrderIter/OrderConstIter . Added documentation. Corr Reg work.

- Correlation Based registration now compiles. Problably needs more work.
- Added MRImage function that compares orientation of input images.
- Documented Accessors and Iterators.