Defined multiple units as a string consisting of comma separated units. e.g.,...

Defined multiple units as a string consisting of comma separated units. e.g., instead of a list ['mBar','Torr'], 'mBar,Torr'. This change requires no adaptation of the source code

src/instruments/Preassure.yaml

@@ -17,13 +17,11 @@ table_header:
     rename_as: vapore_pressure_2_in
   4_Baratron 1 in:
     desc: Baratron measurement 1
-    unit: ['mBar','Torr']
+    unit: 'mBar,Torr'
     rename_as: baratron_1_in
   5_Baratron 2 in:
     desc: Baratron measurement 2
-    unit: 
-      - mBar
-      - Torr
+    unit: 'mBar,Torr'
     rename_as: baratron_2_in
   6_Baratron 3 in:
     desc: Baratron measurement 3