[tz] Behaviour in the face of multiple identical rules

[Paul Eggert]

Arthur David Olson wrote:
> An unmunged version of the patch is attached.

Thanks; that was fast!  I found one minor glitch (ktime could be used before 
it's initialized) and installed the attached variant: this also reindents the 
new code to fit, and documents constraints on simultaneous transitions. 
Although the new diagnostics are a bit wordy, it's probably not worth spending a 
lot of time tweaking them for this unlikely error.
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