rhg: ignore readonly FS error when saving dirstate
The error is already ignored when the .hg directory is read-only,
so this is only fair. (the python hg is silent on readonly fs, too)
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" | \
cat
}