Parameter for adiabatic switching simulation for free energy calculation

<tt>switchoffatoms = [ <i>n i<sub>1</sub> i<sub>2</sub> &hellip; i<sub>n</sub> </i> ]</tt>

<p>
When <tt><i>n</i></n></tt> > 0, 
then atoms <tt>i<sub>1</sub> i<sub>2</sub> &hellip; i<sub>n</sub> </i></tt>
will be gradually switched on or off during the adiabatic switching simulation.

