[merge] split out repository formats

[Aaron Bentley]

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Martin Pool wrote:
> Now personally I would rather in most cases dispense with the Format
> object and class altogether and just hold the actual Repository class or
> whatever.

This is what I don't understand: if you feel (as I do) that the
RepositoryFormat objects should be part of the Repository objects, why
do you want to split them into a separate file?

Aaron
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