Add EN_PRESS_UNITS to EN_getoption & EN_setoption

include/epanet2.bas

@@ -154,6 +154,10 @@ Public Const EN_CMH = 8
 Public Const EN_CMD = 9
 Public Const EN_CMS = 10
 
+Public Const EN_PSI = 0           ' Pressure units types
+Public Const EN_KPA = 1
+Public Const EN_METERS = 2
+
 Public Const EN_DDA = 0           ' Demand driven analysis
 Public Const EN_PDA = 1           ' Pressure driven analysis
 
@@ -182,6 +186,7 @@ Public Const EN_TANKORDER = 21
 Public Const EN_CONCENLIMIT = 22
 Public Const EN_DEMANDPATTERN = 23
 Public Const EN_EMITBACKFLOW = 24
+Public Const EN_PRESS_UNITS = 25
 
 Public Const EN_LOWLEVEL = 0      ' Control types
 Public Const EN_HILEVEL = 1