Added 3D to driving_function_mono_wfs_ps()
Added a WFS driving function for plane waves
Add driving function for WFS and focused sources
Updated comments in driving functions
Added driving function for WFS line source
Fixed comments
Added a dimension independent wave_field_mono_wfs function
Added 'circular' as additional name for a circular array
Removed obsolete driving functions
Added a common WFS driving function file
Deleted obsolete WFS wave field functions
Updated test_driving_functions() to work with the new driving functions
Fixed vector_norm bugs in the single WFS driving functions
Updated the ps imp WFS driving function