timezone magic number

[Valery Aronov]

Daniel Quillan wrote:

> I have one comment regarding the timezone file format.
> 
> Why not use a few of 20 remaining bytes in tzh_reserved field for a
> magic number that would be unique to timezone data files?  4 bytes at
> the beginning of the file would be great, but if you're concerned
> about space then 2 bytes would do the job if selected carefully.

I would like to add that we need it to be PERSISTENT: even if timezone
would not exist anymore its magic number should be preserved. It
makes possible to use them for database storage.

Valery
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