[tz] Proposed patch - Theory notes for backward file

[Lester Caine]

Stephen Colebourne wrote:
> "The file 'backward' consists of Link entries mapping two names. These
> are typically interpretted as a link to a modern name from an older
> name. If the data set is used with the 'backward' file file excluded,
> then it must remain logical and complete."

backward is just another cross reference. Adding the data to the 'extended' file 
I'm outlining and add the from and to dates that the name was used for in 
published data ... puts back missing history ...

This is starting to jell ...

-- 
Lester Caine - G8HFL
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