This commit splits the creation of WellProductionProperties objects,
and especially the ad-hoc helper functions historyProperties()
and predictionProperties() out to a separate module,
WellProductionProperties.[hc]pp. Creating the properties object
from a DeckRecordConstPtr is deferred to two named constructors,
WellProductionProperties::history() and
WellProductionProperties::prediction()
that, respectively, assume the roles of historyProperties() and
predictionProperties(). Reimplement handleWCONProducer() in terms
of these named constructors and remove the producerProperties()
helper whose task, inspecting the status and retrieving/setting the
CMODE if not SHUT, can be assumed by handleWCONProducer().
Add a simple test module, WellPropertiesTest.cpp, to enforce the
rather peculiar semantics of the WCONHIST keyword. Control modes
{O,W,G}RAT, LRAT, and RESV are *always* (unconditionally) supported
in WCONHIST but there is no control mode switching. The latter is
deferred to client code, depending on the '.predictionMode' flag.
Suggested by: [at] joakim-hove
ef5a9e8e1a