We effectively ignore JFUNC data unless end-point scaling is
activated through the ENDSCALE keyword in the RUNSPEC section.
Alert the user to this fact by terminating the simulation run if the
case uses JFUNC without ENDSCALE present in RUNSPEC. In this case,
issue a diagnostic message of the form
Error: Unrecoverable errors while loading input: Problem with keyword JFUNC
In CASE.DATA line 125
Incompatible keyword combination: JFUNC declared, but ENDSCALE is missing.
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