minor changes in names in build_xsedes file. nice balancing act in the recustomize...

minor changes in names in build_xsedes file.  nice balancing act in the recustomize macro now; we wanted to not just whack the directory, since people might have added things besides a canonical customization set.  however, if we don't whack the directory, there will be a bogus old version of a script if the customization files have had a file deleted or renamed.  so, in a compromise to fix this, we now use the feisty meow version of safedel to remove the old custom folder, so that any extra stuff is actually preserved.  and this script noisily tells what it did, so the user can see the folder went away.