pbuilder using QEMU as backend

 pbuilder implementation for QEMU.
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 qemubuilder create -- builds QEMU cow base image.
 .
 qemubuilder update -- updates QEMU cow base image.
 .
 qemubuilder build -- builds package inside QEMU cow base image.
 .
 Gives a pbuilder interface for emulated cross-building environments
 using qemu.
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 pbuilder is a tool for building and testing Debian package inside a
 clean chroot, and qemubuilder implements similar experience over
 emulated CPUs. This tool allows building package inside emulated
 Debian environment for different CPU architectures supported by qemu.