Correctly mark data files with ODBL and DBCL license

tests/wells_no_perforation.data and tests/msw.data were falsely marked
as GPLv3, the rest was missing lincense marks.

tests/msw.data

@@ -1,23 +1,11 @@
+-- This reservoir simulation deck is made available under the Open Database
+-- License: http://opendatacommons.org/licenses/odbl/1.0/. Any rights in
+-- individual contents of the database are licensed under the Database Contents
+-- License: http://opendatacommons.org/licenses/dbcl/1.0/
 
 --  Copyright 2015 SINTEF ICT, Applied Mathematics.
 --  Copyright 2016 Statoil ASA.
 
---  This file is part of the Open Porous Media project (OPM).
-
---  OPM is free software: you can redistribute it and/or modify
---  it under the terms of the GNU General Public License as published by
---  the Free Software Foundation, either version 3 of the License, or
---  (at your option) any later version.
-
---  OPM is distributed in the hope that it will be useful,
---  but WITHOUT ANY WARRANTY; without even the implied warranty of
---  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
---  GNU General Public License for more details.
-
---  You should have received a copy of the GNU General Public License
---  along with OPM.  If not, see <http://www.gnu.org/licenses/>.
-
-
 -- geophysics and fluid properties are copied from Norne
 
 RUNSPEC