Add missing debug preprocessor macros to avoid try to use debug functions when building in release mode. Fixes release builds.
Fix mispelling on Timothée Giet's name
Change Timothée's nick name (satrip->Animtim)
Fix bug #449  -  Cairo render on workarea, onion skin transparency lost
Fix bug #420 - The Add keyframe button shouldn't be active if there is not timeline
button status updated on signal canvas_interface->signal_rend_desc_changed
Doc Comment Generator - Class : Dock_Keyframes
KeyframeActionManager : little bug hunt (resolution genete)
- KeyframeActionManager::time_changed_connection assignement was wissing
- test before KeyframeActionManager::selection_changed_connection & KeyframeActionManager::time_changed_connection disconnect