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medialibrary.py Don't check if a list is inferior to an int ..

when removing sources.
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
check: Make the GstPluginDependency check on Gst more robust
bin: Stop if the modules initialization failed
m4: Ignore generated libtool m4 files
tests: Resurrect timeline undo tests
tests: Initialize the logs also when running nosetests3
undo: Remove duplicate signal
undo: Get rid of the debug action log observer
bin: Fix DATADIR usage in the pitivi script
bin: Make localedir a local variable in the pitivi script
misc: Remove unused methods and move other two
bin: Fix the startup script so the dogtail tests can run