fix bug and remove redundant initialisation in MultiphaseSetKernelBlockVisitor / remove unused parameter in MultiphaseInitDistributionsBlockVisitor

Implements a phase distrortion limiter which is supposed to improve stability. The limiter value is currently hard code to an arbitrary value: limVis = 0.0000001;

fix an issue with initialization  of beta and kappa parameters in MultiphaseTwoPhaseFieldsPressureFilterLBMKernel after restarting, need global refactoring kernel parameters

Pressure filter and pressure gradient computed so that boundary conditions can be used. Everything is limited to a single block.

Velocity formulation with filtered pressure and handmade periodic boundary conditions. WORKS ONLY WITH ONE BLOCK! No other boundary conditions.

Velocity fomulation without viscosity correction and no output for pressure and wrong output for velocity