changed timestep control in molecule::move to tEnd > (SMALL*SMALL)) to allow for short timesteps (1e-14) for MD.  Problem only occuring in parallel.  Added tutorials for gnemdFoam: constrictedChannel and nanoNozzle
removed constantidList from constrictedChannel
removed idList from constrictedChannel

Updated gnemdFoam, mdEquilibrationFoam and molConfig applications to use new separate potential and molecule libraries.  Updated potentialDict description in mdEquilibrationFoam/periodicCube test case to new format.

  * some warnings were spurious with gcc-4.3.0, but gcc-4.3.1 correctly
    flagged these problems:
    - processorLduInterfaceTemplates.C

Changed src/lagrangian/molecule folder to molecularDynamics and split off separate potential library.

parate potential library.