BUG: New method for MSP estimation in BCD

An important bug is catched in BCD. Previously BCD input was manipulated in
many cases that would make the final ResampleInPlace meaningless!

Now, MSP estimation is done in a new way to preserve the original input
image.
Merge pull request #100 from aghayoor/bcdFix_p2_v1

BUG: New method for MSP estimation in BCD