function names changes, some minor changes

da/baseclasses/observationoperator.py

da/baseclasses/optimizer.py

da/baseclasses/platform.py

da/ct/obs.py

da/ct/obspack.py

da/ct/obspack_geocarbon.py

da/ctgridded/dasystem.py

da/ctgridded/statevector.py

da/platform/huygens.py

da/platform/jet.py

da/platform/maunaloa.py

da/tm5/observationoperator.py

da/tools/initexit.py

da/tools/pipeline.py