previewers: Renames to clarify the usage
previewers: Try to make sense out of _compute_geometry
previewers: Remove unused method
timeline: Regroup actions setup logic
timeline: Move text constants in the method where they are used
timeline: Disable the selection actions when timeline focused but there is no selection
timeline: Avoid calling a callback method directly
timeline: Get rid of method used in a single place
timeline: Test directly the element, not its parent
timeline: Be more strict when a timeline element is added
application: Remove unused signals
Move the gitignores to a single file
bin: Make sure we use python2 on systems from the future
Remove retired maintainer from the DOAP file aimed at packagers
Remove obsolete svn file
pipeline: Raise an exception when setting the timeline fails
pipeline: Simplify logging of obtained duration value
elements: Remove code with no effect
elements: Avoid 0-sized clips to become invisible
project: Add the aspect_ratio dynamic property