Make sure when that only mhf events are detached, just in case someone uses the exact same label on event hooks.

Author Mere <rift@dokein.co.uk>
Author date 2013-07-14 10:52:29
Author local date 2013-07-14 11:52:29 +0100
Committer Mere <rift@dokein.co.uk>
Committer date 2013-07-14 10:52:29
Committer local date 2013-07-14 11:52:29 +0100
Commit 8605a4de69d6ee31dad064bdefd9c27fb1f86cb1
Tree ed3c536363d3495a4c09554d596e0cee9ed49ae0
Parent 71306daf9cffc26c92f50562e6a6877e9c802c68
Make sure when that only mhf events are detached, just in case someone uses the exact same label on event hooks.