tic sometimes silently ignores the -o option

[Sven Joachim]

There are situations where tic silently ignores the -o option and writes
to the default output directory (/etc/terminfo or ${HOME}/.terminfo)
instead.

- If the output directory is not writable or cannot be created, e.g.
  "tic -o /somedir myfile" or "tic -o /etc/terminfo myfile" as a normal
  user.

Should tic fail or warn in such situations?

- If the output directory and its parent do not exist, e.g.
  "tic -o /some/dir myfile" as root or as a normal user.

Should tic create missing parent directories?

For background, please see https://bugs.debian.org/1040048.  To the
naive user it is certainly surprising that tic was asked to write to
debian/di-utils-terminfo/lib/terminfo and complained about the totally
different directory /sbuild-nonexistent/.terminfo.

Cheers,
       Sven