Not asking sum_rate/vol for wat/oil/gas is a programmer error in the
library and shouldn't happen, but is unfortunately unverifiable with the
current tooling. The fall-through now signals a runtime error instead of
silently returning the wrong value.
To clarify intent and the high-level formulas used to calculate the
requested values, a series of partial applications are introduced since
most parameters to the functions are fixed from the caller.
This increases signal-to-noise ratio in the switch dispatch, at the
expense of some boilerplate before the switch itself.
Support for the creation and output of ecl-compatible SUMMARY-section
configured files. Supports a set of Well keywords, with unit conversions
based on user request, and comes with a test suite.
