Updated RMG pressure dependence to accept proper output from calculation.
Updated RMG pressure dependence to accept proper output from calculation.

The method Network.calculateRateCoefficients() now returns both the matrix of
k(T,P) values and the corresponding pseudo-steady population distribution
vectors. Although RMG only needs the former, it needed to be updated to know
about the latter.

enochd/RMG-Py,pierrelb/RMG-Py,chatelak/RMG-Py,KEHANG/RMG-Py,faribas/RMG-Py,nyee/RMG-Py,KEHANG/RMG-Py,faribas/RMG-Py,nyee/RMG-Py,nickvandewiele/RMG-Py,enochd/RMG-Py,chatelak/RMG-Py,nickvandewiele/RMG-Py,comocheng/RMG-Py,comocheng/RMG-Py,pierrelb/RMG-Py