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

src/types.h

@@ -83,6 +83,7 @@ typedef  int          INT4;
 #define   MperFT      0.3048
 #define   PSIperFT    0.4333
 #define   KPAperPSI   6.895
+#define   BARperPSI   0.068948
 #define   KWperHP     0.7457
 #define   SECperDAY   86400
 
@@ -239,7 +240,9 @@ typedef enum {
   PSI,           // pounds per square inch
   KPA,           // kiloPascals
   METERS,        // meters
-  UNITDEFAULT    // default based on unit system (SI or US)
+  BAR,           // bar
+  FEET,          // feet
+  DEFAULTUNIT    // default based on unit system (SI or US)
 } PressureUnitsType;
 
 typedef enum {