[DAS2] new writeback URI

[Allen Day]

Hi,
You can POST writebacks for the
http://das.biopackages.net/das/genome/human/writeback/ vsource here:

  http://genomics.ctrl.ucla.edu/~allenday/cgi-bin/das2xml-parser/stable2.pl

The returned document will either be an <error/> element, or a <MAPPINGS/>
element, depending on what was POSTed.

I will update the relevant sections in the main sources/source/vsource docs
on the biopackages server.

I will send another email when the response document is up-to-date with the
latest specification revisions -- I'm under the impression I just have to
return das2xml for all updated and created features instead of returning the
previously specified <MAPPING/> element.

-Allen