Update damage.lua

* Remove superfluous '~= nil'
Update gstate.lua

* Fix M.Now.eventptr[] to fill "NOEVENT" as a non-existent state value
* Fix M.Sect to fill "EMPTY" explicitly
* Move Event code documentation to the first apperance at M.Param.eventdly[]
Update schedule.lua

* Change M.reschedule() argument name
* Fill Now.eventptr[] by "NOEVENT" when executing M.unschedule()
* Remove resolved @todo lists