BUG: Fix 23 BCD test failures on medusa

23 BCD tests were passed successfully on Mac but failed on Linux.
I fixed these tests by making multiple baselines for each.
STYLE: Remove unnecessary CLUSTER tag from config file

The config file had an unnecessary CLUSTER tag that had no functional capabilities. Removed from parsing.
BUG: Multimodal registration into BABC
ENH: Improve SyN registration in BABC

BUG: Attempting to allow SyN registration as input.
BUG: Make SyN registration accept nonlinear transforms as initialTx
ENH: SyN output of ANTs has the initTx included
ENH: Add SyNFull to BRAINSFitHelper
ENH: Only one level of SyN Reg is run if AtlasToSubjectInitTx is SyN
BUG: kNN output were improperly propagated. Fixed
ENH: Trying to add sqrt of multiplied posteriors
ENH: Automatically calculate the number of sampels to use

When generating a KNN tree, using as many good
samples as makes for a balanced tree can improve
robustness.  This patch dynamically calculates
the minimum number of samples that can be extracted
from a label map within the desired threshold.

ENH: Reducing the KNN samples size.
ENH: Avereged warped intra subjects

A function is added that warps all of the intra subject images
(m_IntraSubjectOrigImageList) to the "key subject image" using
the intra subject registration transforms (m_IntraSubjectTransforms).
Then, it averages all T1s together and T2s together to provide
the T1 and T2 fixed images for the atlas to subject multi-modal registration.
ENH: Write debug warped intra subject images to the disk
ENH: Add initial masking to Averaged images

By masking the average images, we can limit the variance of the non
brain regions to a smaller set of values for estimations.
ENH: Update to include SEM generated interfaces.

This is needed to include changes made to BRAINSABC
ENH: Fix BRAINSABC for AutoWorkup.

Added a manual ants based segmentation prior to BRAINSABC.
ENH: Improved fine grained control of processing

The various units of processing can now be independantly
selected.  This improves overall performance.
ENH: Added fixes for ITK FixedParameters.