+20120901
+ + add a null-pointer check in _nc_flush (cf: 20120825).
+ + fix a case in _nc_scroll_optimize() where the _oldnums_list array
+ might not be allocated.
+ + improve comparisons in configure.in for unset shell variables.
+
+20120826
+ + increase size of ncurses' output-buffer, in case of very small
+ initial screen-sizes.
+ + fix evaluation of TERMINFO and TERMINFO_DIRS default values as needed
+ after changes to use --datarootdir (reports by Gabriele Balducci,
+ Roumen Petrov).
+