advection diffusion boundary conditions
move advection diffusion boundary conditions to BoundaryConditions folder and delete:
QADPress7; QADPress27; QADPressNEQNeighbor27; QADVel7; QADVel27; QAD7; QNoSlipADIncomp7; QNoSlipADIncomp27; QADVeloIncomp7; QADVeloIncomp27; QADPressIncomp7; QADPressIncomp27;