reduced the tolerance for checking whether a point lies internal or e…

…xternal to a surface, by a factor of 10. fixes an issue of seed points being created outside the surface. previous tolerance allowed this when the vector from internal to seed point was very close to surface element boundaries

src/lib/mesh_utilities.f90

@@ -875,7 +875,7 @@ function point_internal_to_surface(num_vertices,triangles,point_xyz,vertex_xyz)
     integer :: i,ncrossed,ntri,num_triangles
     real(dp) :: area,area_triangle,cofm_surfaces(3),denominator,&
          norm_v(3),point(3),P1(3),P2(3),P3(3),u
-    real(dp),parameter :: dist_tol = 1.0e-4_dp, user_tol = 1.0e-14_dp
+    real(dp),parameter :: dist_tol = 1.0e-5_dp, user_tol = 1.0e-14_dp
     logical :: cross_any
 
     num_triangles = count(triangles(:,:).ne.0)/3.0_dp