Fixed recording for tee -> identity conversion/hack.
We remove audio/video sink when encoding and put them back when finished.
* pitivi/playground.py:
added debug for position signal emission.
* pitivi/ui/complextimeline.py:
don't send a negative frame value to toplayer's timelinePositionChanged
* pitivi/ui/encodingdialog.glade:
Better order for buttons.
Cancel button becomes close button.
* pitivi/ui/viewer.py:
Grey-out (set_sensitive()) the main window when the encoding dialog is showing.
Lots of fixes with the EncodingDialog:
_ Close button becomes cancel when encoding
_ Show Time Left in progressbar
_ Use playground's 'position' signal


git-svn-id: svn+ssh://svn.gnome.org/svn/pitivi/trunk@779 d3729300-e425-0410-8a4c-d956edccc248