update largestFluidTimeStep function for Darcy solver
put hydraulic parameter calculations in separate functions
finalized implementing Darcy solver parameters in python module
implement Darcy file IO
added Darcy structure for parameters
add tolerance criteria
add darcy host functions, many still invalid
add parameter comparison for darcy solver
add test for IO when Darcy fluid solver is used
use correct index function, call relevant memory dealloc, bump version no
interaction force is f_p not f_d
rename checker flag to CHECK_FLUID_FINITE since it will also be used in Darcy kernels
add preliminary Darcy solver functions
only run navier stokes kernels when relevant
implemented first kernels in solution procedure
add calculations of pressure diffusion components
phi unused in Goren eq. 15
remove unused parameters
add pointers for new arrays
optimize velocity divergence computations