Upstream (opm-parser) now provides a better Equil + EquilRecord, and
simultaneously deprecated EquilWrapper. This patch fixes the resulting
breakage.
One important note: The new Equil does not expose integers for live
oil/wet gas initialization procedure methods, but rather booleans
through constRs/constRv methods. This is how the variable behaves
according to the Eclipse reference manual (EQUIL keyword section).
Code has been updated to reflect this.