BerkeleyGW 3.0.1 and Octopus 11.4

In BerkeleyGW 3.0.1 the write_*_header routines has changed their arguments converted to allocatable. This results in problems when building Octopus with BGW support since in Octopus the arrays are pointer.

This is a change from BGW 2 to BGW 3.

I don't know the full extent of BGW routines making this change, but it seems globally changed.