Item10384: Add 'rev' attribute to META:FORM

Let's record the revision of the DataForm used to save a topic.

Then, to find all topics that need 'review' after a dataform change, you could do

%SEARCH{
  "form.name/info.rev > form.rev"
  type="query"
  header="Topics using stale System.DataForms"
}%

-- PaulHarvey - 21 Feb 2011

Defer to 2.0.

-- GeorgeClark - 02 Jun 2014

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