[LEGAL] Use global LICENSE/COPYRIGHT files, remove boilerplate text

- Preserved explicit 3rd-party copyright notices
- Explicit boilerplate should not be necessary - copyright law applies
  automatically in all countries thanks to Berne Convention + WTO rules,
  and a reference to the applicable license is clear enough.

setup/win32/static/doc/LICENSE

@@ -1,6 +1,9 @@
-OpenERP is published under the GNU AFFERO GENERAL PUBLIC LICENSE, Version 3
+
+For copyright information, please see the COPYRIGHT file.
+
+Odoo is published under the GNU AFFERO GENERAL PUBLIC LICENSE, Version 3
 (AGPLv3), as included below. Some external libraries and contributions bundled
-with OpenERP may be published under other AGPLv3-compatible licenses. For
+with Odoo may be published under other AGPLv3-compatible licenses. For
 these, please refer to the relevant source files and/or license files, in the
 source code tree.