fixed bug in explicit flux on i-faces near boundaries
added ability for more than one lusgs sweep
bug fix in function to get neighbors in J direction
changed viscous spectral radius calculation to occur during gradient calculation, removed viscous flux jacobian loops/functions
changed viscous spectral radius calculation to that in Blazek
changed MUSCL to account for grid stretching
removed mainDiag variable in LUSGS calculation
no longer need inviscid flux jacobian functions
minor formatting changes