Double standard time (typo)

[Paul Eggert]

Jesper Norgaard Welen <jnorgard at prodigy.net.mx> writes:

> The Moncton rule returns twice to standard time in 1956 ... that should
> not have any bad effect since the first one "wins", but does give a tiny
> bit of overhead

Thanks for finding that glitch; I'll include your suggested change
(which indeed matches Shanks & Pottenger's table) in my next proposed
patch.