Removed sleef as default dependency

Author: tbetcke

Cargo.toml

@@ -1,7 +1,7 @@
 [features]
 sleef = ["rlst/sleef", "green-kernels/sleef", "ndelement/sleef", "ndgrid/sleef"]
 strict = []
-default = ["sleef"]
+default = []
 
 [package]
 name = "bempp"

src/function.rs

@@ -509,6 +509,8 @@ where
                     received_ghost_entity_dofs
                 ) {
                     let local_index = entity_dofs[dim][entity][entity_dof];
+                    // Since we own the dof the corresponding entry in `global_dof_numbers` is already filled.
+                    // So we can use it to get the global dof number.
                     ghost_global_dofs_to_send.push(global_dof_numbers[local_index]);
                     ghost_local_dofs_to_send.push(local_index);
                 }