[commit/head+branch] update COPYING - now GPL v3

[Joel Brobecker]

Noticed by Michael Snyder, COPYING was still including the GPL v2.
Fixed thusly.  We still have some header issues in the sim/ directory,
but I'm going to take a break from CVS.

2009-12-21  Joel Brobecker  <brobecker@adacore.com>

        * COPYING: Update to GPL version 3.

Checked in HEAD + 7.0 branch.

-- 
Joel
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