* tzfile.5 (SEE ALSO): Mention zdump(8), zic(8).
* zic.8: "any number of" -> "one or more" white space chars.

Problem reported by Michael Deckers in
<http://mm.icann.org/pipermail/tz/2013-September/020206.html>.
* zic.c: Output version-2 format files if possible.

We don't know of any clients where this makes a difference, but it
is a more-conservative change, as in theory older clients could
reject version-3 format files merely because of the version number.
(ZIC_VERSION_PRE_2013): New macro.
(writezone): New arg 'version'.  All callers changed.
(outzone): Output version-2 format files unless the capabilities
of version 3 are used.