This commit replaces the existing system for writing summary and
specification (SMSPEC) files with a new implementation based on
class EclOutput. We package the evaluators of individual parameters
in a set of classes determined by the parameter's category which
each implement a virtual 'update()' function. This update function
ultimately writes new values into a SummaryState object.
Add a factory-like system for instantiating the appropriate class
depending on a SummaryNode's 'category()'. Also, add a helper class
for managing the parameters that a configured in a simulation
model's SUMMARY section in order to distinguish these from those
parameters that are merely needed for restart purposes. The summary
class's 'eval()' function then becomes a loop over the evaluators
for parameters in SUMMARY followed by a loop over the evaluators for
restart vectors.
We reimplement the 'internal_store()' function in terms of an
std::vector of a helper structure 'MiniStep' which holds a ministep
ID (contiguous counter started at zero), a report step ID, and all
the evaluated parameters of this ministep. The final write function
then consists of outputting those ministep structures that have
accumulated since the previous call to write(). If a simulation
does not call write at all, then this will accumulate all parameters
for all ministeps throughout the simulation history.
We create the SMSPEC file at most once, and write to it at most each
report step. We create the summary file once (if unified) or at
each report step (if separate).
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