BerkeleyGW 3.0
Description
Update the BerkeleyGW interface such that the code compiles with the version 3.0.
Closes #545 (closed) .
News snippet
Update the BerkeleyGW interface such that the code compiles with the version 3.0. Older versions are no longer supported.
Checklist
- 
I have checked that my code follows the Octopus coding standards 
- 
I have added tests for all the new features added in this request. 
Edited  by Martin Lueders