AST-1406 Add parallel gridding argument
Stop using one gridder per thread, since WSClean then uses too much memory.
Instead, use the default setting of WSClean (no parallel gridding) and allow overriding via the workflow command line.
Stop using one gridder per thread, since WSClean then uses too much memory.
Instead, use the default setting of WSClean (no parallel gridding) and allow overriding via the workflow command line.