Blender Git Loki

Temporary fix for "freezing when pointcache is baked":
* WM_timecursor is broken somehow, so pointcache baking makes the cursor disappear.
* For user this seems like blender has frozen although it's just a matter of no progress indication.
* This fix just sets the default "busy" cursor for the whole duration of baking and reports progress in the console.
* If there's and easy fix for this then it should probably be done straight away, but I want to re-implement baking using the job system soon anyways, so a proper fix for this is not strictly necessary.