+ improve test/ncurses.c color-cycling test by reusing attribute-
and color-cycling logic from the video-attributes screen.
+ add ifdef'd with NCURSES_INTEROP_FUNCS experimental bindings in form
library which help make it compatible with interop applications
(patch by Juergen Pfeifer).
+ add configure option --enable-interop, for integrating changes
for generic/interop support to form-library by Juergen Pfeifer
+ add configure script --enable-sp-funcs to enable the new set of
extended functions.
+ start integrating patches by Juergen Pfeifer:
+ add extended functions which specify the SCREEN pointer for several
curses functions which use the global SP (these are incomplete;
some internals work is needed to complete these).
+ add special cases to configure script for MinGW port.
+ modify screen.* terminfo entries using new screen+fkeys to fix
overridden keys in screen.rxvt (Debian #478094) -TD
+ modify internal interfaces to reduce wgetch()'s dependency on the
global SP.
+ simplify some loops with macros each_screen(), each_window() and
each_ripoff().
+ continue modifying test/ditto.c toward making it demonstrate
multithreaded use_screen(), using fifos to pass data between screens.
+ fix typo in form.3x (report by Mike Gran).
