[tz] Portugal

[Tim Parenti]

I have resolved an implementation error which was present in the patch I
originally drafted as well as Paul's later rebase.  The resulting rebase is
attached (0002) and has been pushed to the development repository alongside
some minor administrative fixups (0001).

As with the original draft patch, the updated patch attached extends the
former 1947–1965 "spring forward" rule to Apr 1966, recharacterizing the
period from 1966-04-03 through 1966-10-02 as DST prior to the enactment of
year-round CET, since this more closely reflects how law entered into
force.  However, this left "Port" rules toggled into DST and so
necessitates an explicit "fallback" rule upon resumption of seasonal time
changes, which this version adds for Sep 1976.

Thanks also to Paul for the work on ziguard.awk to help accommodate these
changes.

--
Tim Parenti

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