changed data.

identifying reference image associated with a FIRST vtk file.

space as another.

and hashbang into every .py file.

path looks like part of an incomplete file group.

when called programmatically.

programmatically invoked.

the default file extensions (i.e. the FSLOUTPUTTYPE) - this is used by
the fslpy_immv/imcp command line scripts.

appropriate extension

covered 'at least two elements' anyway. Maybe this will bite me, I
don't know.

idea is to have $FSLDIR/bin/imcp\/immv call these scripts.

sinfully ugly.

copies/overwrite errors. Made imcp overwrite check more robust.

dictionary. Intead, they use 'file groups', which is conceptually much
easier to understand. New functions splitExt and getFileGroup.

Also added imcp and immv functions, which perform the equivalent of the
FSL imcp/immv scripts (but are more general).