Uconf

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*Bugfix:*

* uconf diff and uconf backdiff behave as expected:
they show the diff that would be applied to target/source.
* Fix hostname computation

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*Bugfix:*

* Fix handling of subcommand errors
* Fix default encoding of files

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*New:*

* When a command fails on a file, keep working on other files

*Bugfix:*

* Fix priority of file rules (first rules are executed first)

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*Bugfix:*

* Packaging fixes

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*New:*

* First working version of uconf

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*New:*

* First draft of a project rewrite, as 'uconf'