Do not copy packages and source code around

See bug #762256

When LFClass takes over control of the build process, this excessive copying of source code and packages will be eliminated altogether.

It is difficult (if not impossible) for a shell script to communicate outside a chrooted file system. However in LFClass the build process could spawn in a separate thread, giving signals from that thread to an un-gzip/bzip-service, which will then extract archives to the chroot, which to the service is just another subfolder.

Then, whenever a new package is created it signals a moving service, moving the new archive from the chroot/subfolder directly to the 'packages-<arch>' folder.

This all will eliminate excessive file system writes, and keeps the compiled packages safe from corruption.