- Update COPYING and VEX/LICENSE.GPL to version 3.
- Update README, NEWS, docs/manual license and contributing text.
- Update file headers to say either version 3 of the License,
or (at your option) any later version.
- Leave tests and perf file headers as is, unless the code is derived
from Valgrind/VEX.
- Leave valgrind.h, cachegrind.h, callgrind.h, drd.h, helgrind.h,
memcheck.h and dhat.h Hybrid-BSD licensed.
Several files still said to write to the Free Software Foundation at a
particular address. Add a reference to <http://www.gnu.org/licenses/>
instead.
Some files that were imported into valgrind from other places still
mention the old address. They should be updated when new versions
get imported.