implemented staggered grid in several functions
last changes to velocity prediction function before compile
wrong gradient
reenable div_phi_vi_v
reformulated divergence() and forcing function
split corrector step into two
corrected face/center indexing
possibly final staggered grid corrections
fix arguments
fix indicies
fix function and variable type
fix typos, the code compiles without errors or warnings
increase size of staggered grid array allocation
added ghost nodes to vidx
removed face node allocation and deallocation on host
removed face node pointers from host
investigating segfaultm small fixes
set pressure ghost nodes before used to determine pressure gradient
verified div(tau) and interaction force = 0
fixed segfault tau due to missing allocation of dev_ns_v_p