BUG: Fix the "ImageCalculator2DHisteqTest" error

I used the proper images for the input and replaced the baseline.
Comprehensive explanations are given in PREDICTIMG-1684 jira ticket.
COMP: fix format for BValue in DWIConvert
Merge pull request #194 from Chaircrusher/BValue_Format

COMP: fix format for BValue in DWIConvert
DOC: Fixed documentation for building BRAINSStandAlone.
COMP: Capitalization of header name fixed