changed logic of resubmittng, now using settings and code of original job file, not a newly created one

changed logic of resubmittng, now using settings and code of original job file, not a newly created one

DaSystem
DaPlatform
ObservationOperator

are now handled before the pipeline, from the das.py contents. This replaces the situation in which they were all 
constructed inside the pipeline based on rc-file items from the da.rc script. This now only serves to identify the 
cycle information, and no longer hold info about the platform, sampling model, and da system used inside a cycle.

Modified the method in which save/restart data is propagated. The observation operator now handles its own start/restart files in its private directory, and
passes the information of data that is needed for a restart to the DaCycle through a list. This list gets appended by all methods, and at the end all files of that
list are copied to the restart/current directory. The contents of that directory replace the restart/one-ago directory at the end of the cycle.