- remove recently added BM_mesh_select_flush_strip(), functions purpose wasn't clear. - add BM_mesh_elem_hflag_disable_test(), BM_mesh_elem_hflag_enable_test() to match existing BM_mesh_elem_hflag_enable/disable_all(), these take a hflag to test before editing each element. This replaces the need for BM_mesh_select_flush_strip().