_NETBSD_SOURCE as this makes cross building from older/newer versions of
NetBSD harder, not easier (and also makes the resulting tools 'different')
Wrap all required code with the inclusion of nbtool_config.h, attempt to
only use POSIX code in all places (or when reasonable test w. configure and
provide definitions: ala u_int, etc).
Reviewed by lukem. Tested on FreeBSD 4.9, Redhat Linux ES3, NetBSD 1.6.2 x86
NetBSD current (x86 and amd64) and Solaris 9.
Fixes PR's: PR#17762 PR#25944
Allows sysinst to place menus below any header text.
Remove msg_*.1 man pages for all the functions (they are in the wrong place
are a fair waste of directory space).
the default one), and with a box around the window if >= 3 lines.
Stop the char delete from killingthe RHS of any box.
Make msg_string a noop for invalid strings (might be quoted text).
is _bogus_ in the face of printf-like message formatting! Instead,
calcuate the max size to format when the message window is set. We know
that we'll never want to format more characters than can fit in the window.
