Auras: simplify the sorting function
Auras: make sure the gap aura is either the buff with the lowest or the debuff with the highest duration
Auras: change to avoid an error. See description

rain_functions.lua:188: attempt to index local "b" (a userdata value)
let's get a bit more verbose
and that's it
aura sorting: clean up
Merge branch 'aurasorting'