Add bi-level advection in OpenCL and SCALES (fortran) interface

created branch 26-add-bi-level-advection-in-opencl-and-scales-fortran-interface

mentioned in merge request !11 (merged)

closed via merge request !11 (merged)

mentioned in commit e1581be7

mentioned in merge request !14 (merged)

mentioned in commit c5c80a5d