RF: Remove .sh prefix for forward-compatibility (e.g. future re-implementation

in another language), and move to a more FHS-compliant location

etc/fslconf/removeFSLWrapper.sh → share/fsl/sbin/removeFSLWrapper

 #!/usr/bin/env bash
 #
 # Remove wrapper script/links in $FSLDIR/share/fsl/bin/ which invoke commands
-# that are installed in $FSLDIR/bin/.  See createFSLWrapper.sh for more
+# that are installed in $FSLDIR/bin/.  See createFSLWrapper for more
 # information.
 
 targets="$@"