Slave CPUs send its atom position <tt>SR</tt> and velocity <tt>VSR</tt> (in scaled coordinates)
to Master CPU (whose <tt>myDomain == 0</tt>).

<p>
Effective only when MD++ is compiled for parallel runs, e.g. with
<tt>SYS = mpicc</tt> or <tt>SYS = mpigpp</tt>.

