+20090906
+ + fix typo s/is_timeout/is_notimeout/ which made "man is_notimeout" not
+ work.
+ + add null-pointer checks to other opaque-functions.
+ + add is_pad() and is_subwin() functions for opaque access to WINDOW
+ (discussion with Mark Dickinson).
+ + correct merge to lib_newterm.c, which broke when sp-funcs was
+ enabled.
+