Merge branch 'release-1.2.4.6' into develop
Align RMINC with how minc-stuffs installs its scripts
added some installation information
some more info on the Mac installation
added warning to anatGetFile, to get a more sensible error message. Up to now, specifying the incorrect method would return: [1] "WARNING: Labels found in the mapping, but not in the file:  1" Error in if (usedlabels[j] == vol[j, 1]) { : argument is of length zero
updated DESCRIPTION (v 1.2.4.7) and NEWS
Merge branch 'release-1.2.4.7'