Loading and Saving of Face XML implemented with FileDialogs

This has added simple options to choose a file on "open" to save over the
current existing facefile, which is represented in the attribute
self.faceSaveFile.

If no valid self.faceSaveFile is found then a filedialogue will open up
asking you to specify a save location.

Simpless....

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Merge branch 'faceFilesBranch'