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titleeditor: Handle float font sizes
titleeditor: Allow adding and editing multiple titles
titleeditor: Workaround TitleSource not saved in xges
tests: Make sure all tests can be run by nosetests3
loggable: Use threading instead of _thread
bin: Allow passing arguments to autogen per module
dogtail: Fix the Python2 dogtail scripts to not use Pitivi Python3 code
bin: Fix gobject-introspection building
check: Make the GstPluginDependency check on Gst more robust
bin: Stop if the modules initialization failed
m4: Ignore generated libtool m4 files