* src/virsh.c: Implement 'virsh edit', 'virsh net-edit' and
	  'virsh pool-edit' commands.  These edit the XML for domains,
	  networks and storage pools respectively, and are the
	  equivalent of doing 'virsh dumpxml; vi foo.xml; virsh define'
	* src/Makefile.am, src/.cvsignore: Auto-generate the net-edit
	  and pool-edit commands.
	* docs/virsh.pod: Updated the documentation.