Rename aeidon to aeidon_import

to avoid module name confusion (between the original module and the advene plugin)
Fix variable name
gui.edit.shapewidget: implement opacity setting
gui.edit.shapewidget: add filled option for Line
core.controller, gui.main, util.importer: _fieldnames is a set()
share/exporters.xml: implement metadataplayer export view
util.helper: display --:error:-- string for invalid timestamps
gui.plugins.videoplayer: fix select_file action
gui.edit.shapewidget: define __unicode__ method for Shape classes
core.plugin: display exception message in case of ImportError
fixed bug in shapewidget (could not restore opacity to 1.0)
Merge pull request #3 from pchampin/patch-2014-01-22

gui.edit.shapewidget: fixed bug in opacity de/serialization
gui.edit.shapewidget: fix property editing bug

After editing properties with double click and closing the edit dialog, the shape would remain in a "moving" state.
gui.edit.shapewidget: "Del" shortcut when a shape is selected in the list will delete it
Merge branch 'master' of github.com:oaubert/advene