- 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.

not available from db.

Removing rhoInf from uncoupledSixDoF... patch, not needed.  Adding
optional rhoName entry to sixDoF... so no rhoInf entry is needed for
simulations that have a rho field, and require than a rhoInf value is
read for those that don't.