Add LICENSE.txt file and license headers to sources

[GoogleCodeExporter]

The root directory should contain a LICENSE.txt file mentioning the code is
under the LGPL, and should also mention the license of any source I based
things off of (mainly scitbx).

Also, all source files should have a header mentioning the author and
license information. See OSG for an example...

Original issue reported on code.google.com by jean.sebastien.guay13@gmail.com on 13 Sep 2009 at 3:28