hgweb: wrap {entries}* of tags with mappinggenerator
They were functions returning a generator of mappings. The laziness is
handled by the mappinggenerator class.
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
}