Comment 3 for bug 499733

I made some changes that add the possibility to save a project-file in ascii mode rather than binary.
The choice is set through preferences window.
Saving in ascii mode permits to modify some details of the project using a text editor (e.g. replace clip files
references)
As I've tried to implement it now this feature simply saves in ascii using cPickle serialization ascii protocol,
in the future it could be used to save in other forms (e.g. xml).
Added some effects XML files as well.