XPLOR interface module

Useful methods:

from <m xplorWrap>.XplorWrap:
  command(string,names) - call XplorWrap.command(). 
  shell()               - invoke the XPLOR interpreter

Useful members:

  simulation: an instance of <m xplorSimulation>.XplorSimulation which 
              represents the atomic structure state within XPLOR.
  wrap:       an instance of <m xplorWrap>.xplorWrap