- change system/controlDict to use functions {..} instead of functions (..);
  * This is internally more efficient
- fixed formatting of system/controlDict functions entry

- pedantic change: use 'return 0' instead of 'return(0)' in the applications,
  since return is a C/C++ keyword, not a function.

while(runTime.loop())
{
...
}

idiom.

Demonstrated in the shallowWaterFoam solver.

- track previous time index and to avoid recalculating averages.
- make sure averages are up-to-date before calling write

- added end() method to functionObject, functionObjectList & associated classes
- moved outputFilters from src/sampling -> src/OpenFOAM/db/functionObjects

- this (now deprecated) idiom:
      for (runTime++; !runTime.end(); runTime++) { ... }
  has a few problems:
    * stop-on-next-write will be off-by-one (ie, doesn't work)
    * function objects are not executed on exit with runTime.end()
  Fixing these problems is not really possible.

- this idiom
      while (runTime.run())
      {
          runTime++;
          ...
      }
  works without the above problems.

even when the dot-product of the Reynolds stress and the gradient of velocity is
negative.  Currently this is done by taking the magnitude, another alternative
would be to take only the positive part.

Better properties for CH4N2O
Limiting the temperature to the boiling-point in parcel

- can call start()/execute() manually regardless of the execution status

- added clear() method to functionObjectList. It also gets called by ~Time().
  This should destroy function objects before anything else gets
  destroyed (eg, objectRegistry).