Re-add Reservoir hydrostatic pressure to CSV test result

Author: softwareengineerprogrammer

tests/example1_addons.csv

@@ -53,6 +53,7 @@ RESERVOIR PARAMETERS,Bottom-hole temperature,,170.0,degC
 RESERVOIR PARAMETERS,Well separation: fracture height,,900.0,meter
 RESERVOIR PARAMETERS,Fracture area,,810000.0,m**2
 RESERVOIR PARAMETERS,Reservoir volume,,1000000000,m**3
+RESERVOIR PARAMETERS,Reservoir hydrostatic pressure,,29430.21,kPa
 RESERVOIR PARAMETERS,Plant outlet pressure,,1067.94,kPa
 RESERVOIR PARAMETERS,Production wellhead pressure,,1136.89,kPa
 RESERVOIR PARAMETERS,Productivity Index,,5.0,kg/sec/bar