minor changes

gridded/da/baseclasses/dasystem.py

gridded/da/baseclasses/optimizer.py

gridded/da/baseclasses/statevector.py

gridded/da/ct/obspack.py

gridded/da/ct/statevector.py

gridded/da/examples/das.py

gridded/da/examples/dasgridded.py

gridded/da/examples/dasjet.py

gridded/da/platform/capegrim.py

gridded/da/platform/huygens.py

gridded/da/platform/jet.py

gridded/da/platform/maunaloa.py

gridded/da/tm5/observationoperator.py

gridded/da/tools/general.py

gridded/da/tools/initexit.py

gridded/da/tools/io.py

gridded/da/tools/io_cdf.py

gridded/da/tools/pipeline.py