Add support for bar and feet as pressure units, fix psi or m for emitters

include/epanet2.vb

@@ -161,6 +161,8 @@ 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_BAR = 3
+Public Const EN_FEET = 4
 
 Public Const EN_DDA = 0           ' Demand driven analysis
 Public Const EN_PDA = 1           ' Pressure driven analysis