A rewritten Summary.cpp with some minor header modifications. Synposis
of the new implementation:
* Uses unordered_map< string, std::function > for dispatch, instead of
multiple functions and a switch
* Some poor man's function composition support has been added
(privately) to avoid a lot of reptition in the post processing.
* Functions assume they work over lists of wells instead of single wells
being special cased - this means groups of well etc. can share
implementation with single wells and field keywords.
* Unsupported keywords are not written in the Summary file.
Furthermore, some comments on special cases and overall approach and
a generally more declarative implementation. This change is invisible to
downstream developers. Users will obviously see no more garbage
keywords.
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