fix typo in error message; database is spelled with one 'b' and three 'a's

Clean up some compile warnings.

POSIX says that use_env(3) must precede setupterm(3).
The former lives in curses.h, but the latter lives in term.h.

This is solved by moving the function to libterminfo.
Because the environment can

POSIX says that use_env(3) must precede setupterm(3).
The former lives in curses.h, but the latter lives in term.h.

This is solved by moving the function to libterminfo.
Because the environment can affect the terminal capabilities for
lines and columns, it follows that the tty size should affect it to.
So move that code to libterminfo and adjust in libcurses.

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Revert botched commit.

term.h

Whitespace

Remove _ti_freeterm as consumers should just use del_curterm.

Embed ansi, dumb, vt100, vt220 and wsvt25 compiled terminal descriptions
into libterminfo.
Constify some foo.

Import my terminfo implementation.
This uses the ncurses terminal definitions.

OK: core@, jdc@