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Added additional options for South America fwd runs, including option to run forward when no observation is found in that cycle.

Added option to transition from 25 to 34 layers for OD meteo after December 2005. Added option to read initial random seed from file. Localization method is now read in from rc file. Changed terminology of mixing ratio to mole fraction.

rename *PlatForm to *Platform

renamed class names Ct- to CO2-
changed class name Observation to Observations 
small cleanup changes to template.py

write_members_to_file: is called with _lag_ instead of lag +1, as inside there was a "lag-1" call... that one removed from inside as well

write_sample_info changed to take the whole path as a parameter: so now we explicitly see the path in pipeline, plus we don't need to return it back.
same for write_obs_to_file

managed imports in obs files

removed a need of using samples.DaCycle=DaCycle (now it is only passed in the "initialize" function)

removed StateVector.isOptimized and replaced with an "optimized" parameter in StateVector.write_to_file call

in obs and obspack_geocarbon adding some parameters to function calls

removed "oldstyle" and "newstyle" checkings from write_obs_to_file (it was added for debugging purposes at some point...)

Corrected reading in of may_reject and may_localize keys from sites_weights.rc, and option added to include only certain hours of the day (for obspack files containing hourly observations)

performed actions discussed in email #2
removed unused __str__ functions
a bit of ordering of the pipeline.py

got rid of the getid and getversion functions (replaced with direct references to identifiers when used)
did a cleanup to dagridded/statevector

made cleanup in tm5_obsoperator
changed functions names - part 1
removed empty Validate function in obs, as well as its call
removed empty Initialize function in dasystem, as well as its call in pipeline (it's still called in some main functions)

- reduced to one the two-command messages logging 
- removed unnecessary commas and brackets in tuples definition
- removed unused imports
- __str__ definition: changed print to return
- removed unused values attribution ("dummy = ...")
- formatted the code
- repaired bad indentation
- removed dummy returns ("return None")
- removed non-meaning body of baseclasses.optimizer.Localize()

flagging scheme now assumes 99 as default (do-not-assimilate) until changed by sites-weights.rc logic