cowbuilder - 0.90+b1 main

'cowbuilder' command is a wrapper for pbuilder which allows using
pbuilder-like interface over cowdancer environment.
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pbuilder is a tool for building and testing Debian package inside a clean
chroot, and cowbuilder allows chroot to be recreated using
hard-linked copies with copy-on-write, which makes creation and
destruction of chroots fast.