Fix orphan test

Classical-MD-Modules/index.rst

@@ -220,6 +220,7 @@ The following modules were developed specifically for the Classical MD pilot pro
     ./modules/contact_concurrences/readme
     ./modules/PIcore/readme
     ./modules/PIhydration/readme
+    ./modules/PI/lammps_pyinterfaceExt/readme
     ./modules/MSJuly2019_minDist2segments_KKT/readme
     ./modules/MSJuly2019_velocities_resolve_EVC/readme
 

Classical-MD-Modules/modules/PI/lammps_pyinterfaceExt/readme.rst

-:orphan:
-
 ..  sidebar:: Software Technical Information
    
    This module is extends the lammps python interface to allow accessing