cleanup - all function names (except sth in tools/rc) in lowercase

.project

.pydevproject

da/analysis/expand_fluxes.py

da/analysis/expand_mixingratios.py

da/analysis/siteseries.py

da/analysis/summarize_obs.py

da/analysis/tools_regions.py

da/analysis/tools_transcom.py

da/baseclasses/dasystem.py

da/baseclasses/obs.py

da/baseclasses/observationoperator.py

da/baseclasses/optimizer.py

da/baseclasses/platform.py

da/baseclasses/statevector.py

da/ct/dasystem.py

da/ct/obs.py

da/ct/obspack.py

da/ct/obspack_geocarbon.py

da/ct/optimizer.py

da/ct/statevector.py