Blender Git Loki

As discussed in meeting, fixing Numinput annoyance in transform.
Numpad Minus can now be used all the time to type negative numbers, without interfering with PET.

WARNING Behavior change: PET area of effect is not resized with Alt-Num+ and Alt-Num- (in addition to the scrollwheel)

WARNING testing needed: it's late and the laptop here has a funny emulated numpad, so better be tested on a real keyboard by someone who is not coding past midnight.