Resolve "MRICH overlap in master branch"

(cherry picked from commit 3efb3867)

compact/mrich.xml

@@ -91,19 +91,20 @@
         </photodet>
       </module>
       <comment>
-        Modules are only listed here for one quadrant
+        Modules are only listed here for one quadrant. The modules point back to the
+        z0 position (should be their actual position, but breaks parametrization).
       </comment>
-      <positions scale="1.03">
+      <positions scale="1.03" z0="157.5*cm">
         <position x="-41.3250000000"  y="178.6750000000"/>
         <position x=" 96.0250000001"  y="178.6750000000"/>
       </positions>
-      <positions scale="1.036">
+      <positions scale="1.036" z0="157.5*cm">
         <position x="-41.3250000000"  y="316.0250000001"/>
         <position x=" 96.0250000001"  y="316.0250000001"/>
         <position x="233.3750000002"  y="178.6750000000"/>
         <position x="233.3750000002"  y="316.0250000001"/>
       </positions>
-      <positions scale="1.052">
+      <positions scale="1.052" z0="157.5*cm">
         <position x="-41.3250000000"  y="453.3750000002"/>
         <position x=" 96.0250000001"  y="453.3750000002"/>
         <position x="233.3750000002"  y="453.3750000002"/>
@@ -111,7 +112,7 @@
         <position x="370.7250000003"  y="316.0250000001"/>
         <position x="370.7250000003"  y="178.6750000000"/>
       </positions>
-      <positions scale="1.078">
+      <positions scale="1.078" z0="157.5*cm">
         <position x="-41.3250000000"  y="590.7250000003"/>
         <position x=" 96.0250000001"  y="590.7250000003"/>
         <position x="233.3750000002"  y="590.7250000003"/>
@@ -121,7 +122,7 @@
         <position x="508.0750000004"  y="316.0250000001"/>
         <position x="508.0750000004"  y="453.3750000002"/>
       </positions>
-      <positions scale="1.09">
+      <positions scale="1.09" z0="157.5*cm">
         <position x="-41.3250000000"  y="728.0750000004"/>
         <position x=" 96.0250000001"  y="728.0750000004"/>
         <!--position x="233.3750000002"  y="728.0750000004"/-->
@@ -132,7 +133,7 @@
         <position x="645.4250000005"  y="316.0250000001"/>
         <position x="645.4250000005"  y="178.6750000000"/>
       </positions>
-      <positions scale="1.095">
+      <positions scale="1.095" z0="157.5*cm">
         <!--position x="-41.3250000000"  y="865.4250000005"/-->
         <!--position x=" 96.0250000001"  y="865.4250000005"/-->
         <!--position x="233.3750000002"  y="865.4250000005"/-->