low-level wrappers for the XPLOR interpreter. 

Explicit reference to this module should not normally be necessary.

  command(cmd, names) -
           evaluates an xplor expression
           names is a list of xplor variable names 
           Returns a list of the values of those variables in the 
           same order as they were requested.

  fastCommand(cmd, names) -
           same as command(), except the assumption is made that no atom
           properties are modified in the XPLOR interface- they are not copied 
           back to the C++ side. This call is much more efficient than
           command().

  shell() - pops one into the XPLOR interpreter shell. Return to the python
            prompt using XPLOR's END statement.

  select(selString) - low level atom selector - returns a list of
                      atom indices.

  setRandomSeed(newSeed) - set XPLOR's random number seed.
  randomSeed()           - get XPLOR's random number seed.
  uniformRandom()       - return and random number between 0 and 1.