Conley Owens 971de8ea7b Refine groups functionality
Every project is in group "default".  "-default" does not remove
it from this project.  All group names specified in the manifest
are positive names as opposed to a mix of negative and positive.

Specified groups are resolved in order.  If init is supplied with
--groups="group1,-group2", the following describes the project
selection when syncing:

  * all projects in "group1" will be added, and
  * all projects in "group2" will be removed.

Change-Id: I1df3dcdb64bbd4cd80d675f9b2d3becbf721f661
2012-04-23 12:39:05 -07:00
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