minor changes

da/baseclasses/dasystem.py

da/baseclasses/optimizer.py

da/baseclasses/statevector.py

da/ct/obspack.py

da/ct/statevector.py

da/examples/das.py

da/examples/dasgridded.py

da/examples/dasjet.py

da/platform/capegrim.py

da/platform/huygens.py

da/platform/jet.py

da/platform/maunaloa.py

da/tm5/observationoperator.py

da/tools/general.py

da/tools/initexit.py

da/tools/io.py

da/tools/io_cdf.py

da/tools/pipeline.py