We support constant flux aquifers (AQUFLUX keyword) entered both in
the SOLUTION and in the SCHEDULE sections. The primary structural
change is that we have to support analytic aquifers being introduced
dynamically, whence the connection information (xCAQ) must be
captured without knowing the full set of analytic aquifers. We
therefore allocate those output arrays purely from the maximum sizes
entered in the RUNSPEC section whereas we defer determining the
maximum aquifer ID to the point of capturing the dynamic values.
The xAAQ values for constant flux aquifers amount to a new aquifer
type integer value (=2) in IAAQ[11] and the flux value in SAAQ[0].