First round of changes: fixed SYMBMM,NUMBMM to use GETROW.

THis has to be updated in two ways:
1. the symbmm/numbmm equivalent must be made smarter (perhaps a cache
for rows extracted from B?) 
2. the whole getrow/getblk/clip chain must be changed.

base/modules/psb_error_mod.F90

@@ -80,8 +80,8 @@ contains
   ! also changes error action to "return"
   subroutine psb_erractionsave(err_act)
     integer, intent(out) :: err_act
-    err_act=err_action
-    err_action=act_ret
+    err_act    = err_action
+    err_action = act_ret
   end subroutine psb_erractionsave