shelve: use the class constant in the clear method
This class attribut is used everywhere else. Not using it in clear will get us
in trouble sooner or later.
fixbundle() { grep -v 'saving bundle' | grep -v 'saved backup' | \ grep -v added | grep -v adding | \ grep -v "unable to find 'e' for patching" | \ grep -v "e: No such file or directory"}