num_waves and num_eqn for Euler_3d.
Make 3D Euler solver work with SharpClaw.
Merge pull request #66 from ketch/euler_3d_values

Euler 3d values
Correct Roe solver; add HLL solver for Euler eqns.
Roe averages in Euler solver are computed in a separate function.
Rebase branch onto updated master.
Merge pull request #68 from hadjimy/rs_euler_eqns

Riemman solver for euler eqns
Update rpn3_euler.f90

Fixed a bug when efix=.false. resulting from uninitialized index variable.
Merge pull request #70 from weslowrie/patch-1

Update rpn3_euler.f90