Change file and path specification to use string formatting
implemented coreg of mean20min to highres image
add concat_xfm, concatenates two coreg mats into one
add call to concatenate dvr2highres and highres2std coregs
add function to apply transform
fixed naming in call to ApplyXFM
added call to apply_xfm to warp dvr to std space
change input to use skull-stripped mean dvr image
Merge pull request #1 from jelman/coreg_mean

Coreg mean