Script Space: new context for Property panel
bpy.app.handlers.quit_pre - callback before quitting Blender
ugly hack to let us re-map the A and ctrl A keys
support SMPTE as input for 'time' fields when unit is set for the scene

you can do 1h3s4
or using smpte directly 1:0:3:4

More on SMPTE:
http://en.wikipedia.org/wiki/SMPTE_timecode
force fcurve AUTO handlers to use 1/3 of the distance for smoothness
see: http://www.blender.org/forum/viewtopic.php?p=65508&sid=02e88fe6e3a43338ec8bc354991bc402

Note: this is also used by the curve code. The magic number 2.5614f
comes from review 290361776e5858b3903a83c0cddf722b8340e699