1.  NaN checking and terminate (final samples if pending, save, execute only breakpoints thereafter)
1b.   Nan checking on stochastic multi-path and continue later paths up to termination.
1c. Terminate simulation after x hours (final samples if pending, save, execute only breakpoints thereafter) -- DONE

2.  Check (and fix?) seeding on the scheduler.  Are the chosen seeds unique?  Document.

3.  Threadsafe the better and faster rand generator.  Add as an option. -- NOT POSSIBLE. erand48 is only slow on OS X.

4.  Nonlinear k-space operators.
	Works in all IP and EX algorithms, although it the nonlinear part itself is never done in the interaction picture.
	a. New nonlinearKOperators element (same features as koperators)
	b. Search for terms in CDATA, just like EX algorithm, with less checks on arguments.
	c. Define underlying variables like EX and initialise them.
	d. Go_space code (like EX)
	e. Check and edit CDATA of the actual nonlinear operator definitions.  This might reuse lines from the original.
	
	<CDATA[
	blah
	blah
	N1[#]=f(k,#);
	blah
	N2[#]=g(k,#);
	]>
	
	dpsi_dt = blahdeblah + N1[psi*h(x)*conj(psi)] + N2[phi];

	f.  Documentation	
	
5.  IP picture checks should cause barfs if people don't read doco.

6.  Case search for MPI+stochastic+npaths=1 issues.  This is not treated consistently.	
	
