Changed the localization routine and settings, so that the localization is actually used. Also added some extra logging messages related to localization.

The code now tests for the presence of the optimizer file, which is False for the purely forward runs. If not present, some steps related to the forecast variables are skipped.

Minor changes to flow of sample_step and sample_state. Caught a possible problem with the get_initialdata for the ObsOperator, which also needs to happen for an advance step.

Implemented the first outlines of a ForwardPipeline that simply runs TM5 with optimized parameters from another run. To be completed...

reverted to r1186 (the last one from 2012), with changes in observation files from r1192-1194 preserved

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)

called from pipeline as call parameters
*warning* take care about get_covariance, it is called from baseclass's "propagate", whereas this function exists only in the derived class.

a lot of my helper comments, but they will disappear soon.

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

ct/tools.py (whole file)
tm5/observationoperator.py: WriteRunRc
tools/initexit.py: SubmitSubStep
tools/general.py: CreateLinks, ToDectime, StoreData, RestoreData

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()