auto open inactive action

the main difference opposed to the old AutoOpen action is the new action won't
touch active tickets.

e.g. if customized active statuses are something like "inquiry", "quoting" and
"bid sent", people usually don't want current active status to be changed by
AutoOpen action at all.
delete a wrong comment
use AutoOpenInactive action instead in the default "On Correspond Open Tickets" scrip

the action is smarter and works better with customized lifecycles
upgrading doc for the new "Open Inactive Tickets" action
Merge branch '4.2/auto-open-inactive-action'