Extend JPK v0.5 parsing back to 0.3 and 0.4 file formats.

On Mon, Aug 23, 2010 at 02:15:08PM +0200, Michael Haggerty wrote:
> The fundamentals of our file format has not changed much since it was
> introduced.  Most of the changes involve metadata, such as how we
> describe force spectroscopy scanning patterns, that are not even
> described in the document that I sent you.