-2 in gtk_widget_set_usize() means 'don't change given dimension'
-2 in gtk_widget_set_size_request() = early quit function w/o an effect, thus change to -1
misc...
* fix scaling for doom3 brush format
* Pointfile function: try to also load .pts leak line file (q1), if .lin isn't found
* snap transform origin for flip commands
* change light intensity save format from %f to %g to prevent .99999 on transforms
* support 'stupid quake bug' (invert pitch in angles)(generic and miscmodel ents)(cfg: entities="quake" in .game)
* clipper: place 1st and 2nd points far, 3rd near to ease 3 points clipping