[RFC] what should we do about COPYING?

[Joel Brobecker <brobecker@adacore.com>]

Michael Snyder pointed out that gdb/COPYING contains the GPLv2,
whereas GDB is now under GPLv3. I was simply going to replace the
contents of COPYING with the GPLv3, except that I noticed an
inconsistent resolution depending on the project. For instance:

  - In the root directory, we have COPYING (v2) and COPYING3 (v3);
  - In bfd, we have COPYING that contains the GPL v3.

I personally do not see the point of keeping the GPL v2 around,
and thus suggest that we replace the contents COPYING rather than
adding an extra file named COPYING3.  Note that we have a couple
of extra copies in the sim directory as well.

-- 
Joel