[DAS] DAS/2.1 spec wiki link

[Steve Chervitz]

Here's the updated link to the new wikified version of the DAS/2.1 spec, the
version that we are free to evolve toward the next version of the spec, as
we work jointly on DAS/1.x and DAS/2.x issues:

http://www.biodas.org/wiki/DAS/2.1/Spec

It's clearly distinguished from the stable 2.0 version that exists as a
static HTML document.

The only section in the 2.1 spec that has content is the retrieval portion
for genomic data:
http://www.biodas.org/wiki/DAS/2.1/Spec/Get-Genomic

Which has been split into separate wiki pages for each DAS/2 document type:
sources, segments, types, features. The other parts (stylesheet, writeback,
region locking, etc.) can be incorporated eventually.

The content of the retrieval spec was taken directly from the DAS/2.0 HTML
document, with enough edits to make it look reasonable in the wiki.  The
overview and details sections for each document type were combined on the
same page. We might want to combine the various example sections into one
(in the HTML doc, there were separate examples in the overview and details
section, which I preserved).

Have fun,
Steve

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