Move functions and variables from guifuncs.[ch] to dcf77pi.c.
Move functions and variables from guifuncs.[ch] to dcf77pi.c.

guifuncs was formerly a sink to handle all common ncurses functionality
in versions 2.0.0 to 2.1.0 but all that has already been moved to dcf77pi

Update included headers.

rene0/dcf77pi,rene0/dcf77pi