SYNOPSIS:
    MERGE filename

DESCRIPTION:
    MERGE a volume file or a set of stacked images into the
    currently loaded file. The volumes must match in size.
    Voxels protected by class set 2 are not replaced.
    The input format is autodetected. If merging a stack, the
    individual files have to be numbered incrementally with
    leading zeros. The incrementing number must be the _last_
    number in the filename.

SEE_ALSO:
    LOAD, SAVE, SAVEP5
