simple implementation of properties for files

[Alexander Belchenko]

Attached patch contains simple implementation of file properties based on config-like storage.
I'm satisfied with this code at this moment and starting to work on line-endings support on
top of this code.

Anybody free to improve this code, write more tests or write documentation for it.
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Name: bzr.prop.simple-3300.patch
Url: https://lists.ubuntu.com/archives/bazaar/attachments/20080329/7bec6e5d/attachment-0001.diff