resolve some compiler warnings with intel c/c++ compiler

* subsurf code had a lot of unused variables, removed these where they are obviously not needed. commented if they could be useful later.
* some variables declorations hide existing variables (many of these left), but fixed some that could cause confusion.
* removed unused vars
* obscure python memory leak with colorband.
* make_sample_tables had a loop running wasnt used.
* if 0'd functions in arithb.c that are not used yet.
* made many functions static

source/blender/src/editmesh_tools.c

@@ -4486,7 +4486,7 @@ static void bevel_mesh_recurs(float bsize, short recurs, int allfaces)
 	}
 }
 
-void bevel_menu() {
+void bevel_menu(void) {
 	BME_Mesh *bm;
 	BME_TransData_Head *td;
 	TransInfo *t;