- eg, pure virtual correct() and read() methods declarations but
  real implementations.

- unused yPlusLam_ member

If no particles are in cloud it does not get written. Hence it would also
not output a vtk file. Changed now to always output lagrangian data.

- pdf updated - needs to be inside pdfs namespace
- added writeData option - write individual data/samples to file

- added Niklas' update to Rosin-Rammler
- new fixedValue type
- code clean-up

- otherwise /lib/cpp may need a different library binding than
  currently available and results in this type of error:

  /usr/lib64/gcc/x86_64-suse-linux/4.4/cc1:
  /data/app/OpenFOAM/ThirdParty-1.6.x/platforms/linux64/gcc-4.3.3/lib64/libstdc++.so.6:
  version `GLIBCXX_3.4.11' not found (required by
  /usr/lib64/libppl_c.so.2)

ENH: remove unused flex++ rule for SiCortex that was identical to the
general one anyhow.

- this allows the bounded field to be used immediately in another
  operation (eg, within a constructor).

ENH: use bounded epsilon_ instead of (epsilon_ + epsilonMin_) in calculations.

- use of xxxMin_ values and code clean-up

ENH: generalize rule for X11

ENH: Avoid move in flex/flex++ rule.