ENH: fixes to allow specifying only one ROI in ROI mode
ENH: fixed error reporting for CenterOfROI initializer
ENH: adding support for ROI BSpline initialization
BUG: revert the unintended changes
STYLE: remove dead code

The code removed could never be invoked, because ROIBSpline transform type is
not an option in the parameter list. I think somehow this code got merged by
accident, it has never been integrated with BRAINSFit before.
ENH: added prostate image test data for ROIBSpline mode
ENH: added test for ROIBSpline mode
STYLE: remove more dead references to ROIBSpline transform type
STYLE: various fixes
* use cout instead of cerr
* add exception
* remove non-applicable comment and todo
Merge pull request #160 from fedorov/ROI-allow-single-roi

ENH: ROIbSpline functionality in BRAINSFit 
Fixes to implement missing functionality