[DAS2] DAS intro

[Ed Griffiths]

Andrew,

> The front of the DAS doc starts
>
>    DAS 2.0 is designed to address the shortcomings of DAS 1.0, including:
>
> That kinda assumes people know what DAS 1.0 is to understand DAS 2.0.

Good to make this change but I also think that there should be a short section
which compares/contrasts DAS 1.0 and DAS 2.0. It should be written to show that
DAS 2.0 addresses the shortcomings of DAS 1.0 (e.g. updating protocol).

Otherwise there is nothing major I would change about the intro., a good change
to make.

Ed
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| Ed Griffiths, Acedb development, Informatics Group,                    |
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|  Hinxton, Cambridge CB10 1HH                                           |
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