chimera2/debian

As chimera 2 is still in alpha test, it may be useful to have both it and
chimera 1.x on the system simulatenously. For that reason, I've renamed
everything from "chimera" to "chimera2".

In particular, the resource class is Chimera2; in earlier releases of this
package I left it as it was, with the result that it found resources
intended for the old version, and messed up many things, particularly the
window size.