update flow arrow

src/menu/physicalPosition.js

@@ -6,9 +6,9 @@ class PhysicalPositionMenu {
     return {
       positionGroups: [
         { group: 'Positional', options: [
-            { value: 'upstream',     label: '← Upstream', icon: '←'},
+            { value: 'upstream',     label: '→ Upstream', icon: '←'}, //flow is then typically left to right
             { value: 'atEquipment',  label: '⊥ in place' , icon: '⊥' },
-            { value: 'downstream',   label: '→ Downstream' , icon: '→' }
+            { value: 'downstream',   label: '← Downstream' , icon: '→' }
           ]
         }
       ],