zone.tab corrections

[Clive D.W. Feather]

Andy McDonald said:
> Europe/London: (!)
> latitude/longitude is incorrect - the current value is somewhere in the
> neighbourhood of Syon House in South-west London
> (http://en.wikipedia.org/wiki/Syon_House). Suggestions for a better
> value welcome.

The official centre of London - where distances are measured from - is
variously either Charing Cross (51d30'30"N 0d07'31"W) or the Post Office
(51d30'57"N 0d05'52"W).

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