fix missing file in Makefile.am
Tune default MinEscapeePct to 14.
This was experimentally determined as the highest value I could get away with for the higher-order Mandeldrops which still causes them to terminate quickly at max zoom-out.
(If you zoom into a never-escaping region, you're on your own.)
LP#1033910: MainWindow now also keeps track of the zoom-out limit. HUD reports this similarly.
Merge branch 'LP1033910-better-res-limit-behaviour'