Merge branch 'dev-scalar-floor' of github.com:helenarichie/cholla int…

…o dev-scalar-floor

src/grid/grid3D.cpp

@@ -157,7 +157,7 @@ void Grid3D::Initialize(struct Parameters *P)
   C_cfl = 0.3;
 
 #ifdef AVERAGE_SLOW_CELLS
-  H.min_dt_slow = 1e-5;  // Initialize the minumum dt to a tiny number
+  H.min_dt_slow = 1e-100;  // Initialize the minumum dt to a tiny number
 #endif                   // AVERAGE_SLOW_CELLS
 
 #ifndef MPI_CHOLLA