Do not copy boot and root into home directory

The former method of copying the contents of filesystem/home was a bit too
recursive and also caught filesystem/boot and filesystem/root due to the
cp -av .* also matching ..

Using dotglob instead fixes this. While at it also turned the chown
and chgrp into one single command.
Merge pull request #43 from foosel/fix/recursiveCopy

Do not copy boot and root into home directory