Fixed some problems in registration.cpp . I get the images, each with a different color,
in the viewer. However, registration does not appear to have worked.
Some more problems fixed. I will now work on an interface for registration.
I now have a stack of options in my window, which allows me to choose between registration parameters
and other parameters.
Main Interface has a selection box (bottom of GUI), which allows to select between
"all parameters", and "registration parameters", since these are two different problems.