Turn on the netbeans option about copying relative jars for distributing
find a bug in Linear2D

  - Linear2D is absolutely wrong before this commit
Find bugs of inner classes in TimoshenkoAnalyticalBeam2D

  - totally mistake Neumann and Dirichlet for each other
Add inner class Mixer and PostProcessor in WFProcessor2D

  - also make WFProcessor implement NeedPreparation
  - this is the first commit that work well for Timoshenko analytical cantilever