BUG: increase the tolerance for BRAINSFitTest_ROIBSpline
BUG: Symmetric bounding box in training and detection phases of BCD
ENH: perform the local search of BCD in Freq domain

The "FindCandidatePoints" method is reimplemented to do the local search
in freqency domain.
First, based on the search bounding box, an ROI image is created from
the input MSP volume. Also, the landmark template intensities are
arranged inside an moving template image.
Then, for both fixed and moving images, corresponding maskes are
created, and the "MaskedFFTNormalizedCorrelationImageFilter" is used to
the final optimum match.

BCD is run faster now:
The average of previous run time: 3m40
The average of current run time: 1m40

That shows more than 2x speed increase.
ENH: add the new template files to ReferenceAtlas/20140916_BCD directory