Started a tidy up in the HMC sector. Now comfortable with the two level integrators;

to a little figure out what Guido had done & why -- but there is a neat saving of force
evaluations across the nesting time boundary making use of linearity of the leapP in dt.

I cleaned up the printing, reduced the volume of code, in the process sharing printing
between all integrators. Placed an assert that the total integration time for all integrators
must match at end of trajectory.

Have now verified e-dH = 1 for nested integrators in Wilson/Wilson runs with both
Omelyan and with Leapfrog so substantial confidence gained.

TODO

@@ -15,18 +15,17 @@ TODO:
 
 => Lanczos
 
-- Rectangle gauge actions.
+ - Rectangle gauge actions.
   Iwasaki,
   Symanzik,
   ... etc...
 
 - Prepare multigrid for HMC.
-  Alternate setup schemes.
+- Alternate setup schemes.
 
-* Parallel io improvements
-  - optional parallel MPI2 IO
-  - move Plaquette and link trace checks into nersc reader from the Grid_nersc_io.cc test.
-  * Support for ILDG
+* Parallel io improvements DONE
+  - move Plaquette and link trace checks into nersc reader from the Grid_nersc_io.cc test. DONE
+  * Support for ILDG --- ugly, not done
 
 * Flavour matrices?