Adding header files and txx files to the project.
Changed some defaults, new AddSinglePoint method.
Removed cutting plane, adjusted spheres.

Temporarily removed cutting plane code.  Adjusted sphere weight down
to 0.01 from 1.0.
Parallelizing optimization step using OpenMP.
Some fixes for groom tools, changed some datatypes and enabled compression.
Changes from centering branch.
Added OpenMP CMAKE options.
Fixes for gcc.
Minor changes to OpenMP stuff.
Added a Linux section that links fontconfig and Xinerama.
Added parallel support for adaptive function.
Commented out changes to centering

Added back cutting plane code, though commented out
When OpenMP is off, perform global step each iteration.
Added Clone method for itkParticleEnsembleMeanFunction