Add defensive code for whratio.
Another may be used uninitialized warning killed.
redraw: allow more redraws per second.

this makes dr mode less laggy.

maybe this is still the wrong place to do this, maybe import (main problem)
should just throttle the signal emission instead.
film: remove unneeded wrapper
film: only redraw once after import, not for every image.
redraw: remove now obsolete flood stopping.
Fix compilation error in previous commit.
Histogram: Expanded