- add const-ness for control variables

- drop unused fluxGradp variable

- use lookupOrDefault instead of found/lookup combination

This reverts commit c600ce54.

- use GPL version 3

STYLE: move polyDualMesh from conversion -> manipulation

Still not good enough - only handles single extrusion vector per cyclic point.

Adding pbFixed so nParticles is specified directly by the user, making
massTotal not determine anything in this case.

Removing unused private data member.

- improve documentation, use GPL version 3

Provides the viscous contribution to the energy equations.

- fix 'forAll (' -> 'forAll(' format (again)

- used in expandDictionary

Now allows specification of inside point to help leaky surfaces.

Also added cellZone and all as source selection mechanism.

sixDoFRigidBodyDisplacement BC restraints and constraints.

sixDoFRigidBodyDisplacement BC entries.