Updated the variable types to reflect changes to MINC (e.g. Volume -> VIO_Volume). This is now geared towards the BIC-MNI minc-toolkit (https://github.com/BIC-MNI/minc-toolkit). There is a bit of a hack in the m4/mni_REQUIRE_MNILIBS.m4 file, because the volume_io library is not provided by MINC anymore.
Merge branch 'adapt-to-minctoolkit-code' into develop
Merge branch 'develop'