ENH: Add DWI scan padding

Now pads image on all sides
ENH: Added dwiestim and dtiprocess to SEMTools
Increase the testing time for the BRAINSFit tests
Merge pull request #195 from aghayoor/BRAINSFit_SyNTestFailures

Increase the testing time for the BRAINSFit tests
GIT: added pep8 configuration file and appended to .gitignore
BUG: Fixed faulty thresholds for WM partial volumes

STYLE: Renamed posteriors list to partials
Merge pull request #198 from dmwelch/enh/pep8

GIT: added pep8 configuration file and appended to .gitignore
Merge pull request #196 from dmwelch/bug/brains-module

brains Python module fix for incorrect WM thresholds
Fix test failures of BRAINSConstellationDetector

Some of the BCD tests were failing because of recent changes on how we
write float numbers as strings.
The results have not changed; just the way they are presented (the
    precision of the floating numbers) have changed. Therefore, I just
replaced the previous baselines by the modified versions.
Fix ccppcheck performance warnings for the BRAINSStandAlone
Merge pull request #199 from aghayoor/BCD_testFailure

Fix test failures of BRAINSConstellationDetector
Merge pull request #200 from aghayoor/cppcheck_performance

Fix ccppcheck performance warnings for the BRAINSStandAlone
COMP: Refactoring introduced syntax error.
cppcheck style warnings
Merge pull request #201 from aghayoor/cppcheck_style

cppcheck style warnings
cppcheck warnings that are marked as warning
Merge pull request #202 from aghayoor/cppcheck_warnings

cppcheck warnings that are marked as warning