Merge CMake 2.8.1 to start branchy workflow

Merge the release branch into master to get its version number, tags,
and ChangeLog.  Revert the version on master from 2.9 back to 2.8.
Future releases will be prepared directly in master.

This is the starting point for a branchy workflow based on one described
by the "git help workflows" man page.  New development will be done on
local topic branches.  Topics will be published by merging them into one
of the integration branches:

 maint  = Maintenance of previous release
 master = Preparation of future release
 next   = Development of features ("next" to be merged into master)

In order to bootstrap the topic-based workflow from here, all changes in
master since the 2.8 release branch started will either be included in
the next release or reverted and recreated on a topic branch.

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