Fix bug with loading old bline
Fix loading old group origin
Sound in preview
Fix color widget
Fix other colors
Enable alternative editing mode by Ctrl key instead Space.
Fix key-frames moving
Fix transformation duck
Fix color again
Fix 555 - Current Time in Canvas Window color not updated when acting on keyframe

* Inform that something has changed about the current time for both
add/remove/change a keyframe by firing canvas_interface::signal_time_changed
Print jobs thrown out to standard error output
Bones : Z-Order To Z-Depth (as discuted in github / commit 4d1c4a40e)

* Change z-order vocable to z-depth for consistency.
* Update code to replace order with depth
* Param descriptor use "bone_depth" internaly

IMPORTANT : This break test project previously created with bones z-order
IMPORTANT#2 : The bone#4 video example should be updated / commented