Accidental edits of the XML document

In the context of the Pitt group, one thing to be careful about when performing annotations in GATE is that you might click into the text area and
introduce characters or white space.

This causes problems when other people are annotating the same documents in parallel and one wants to  perform an automatic comparison of
the two annotations. It also could cause a problem if the additional material gets introduced after the gate_default file that stores the tokenization
for the xml document was created and is not updated.

The upshot is: be really, really careful not to modify the original text!