For the case of two (or more) diamond formulas who all mention the full
agent list, no rule was created, because the former CL algorithm only
created rules for proper subsets of the agent list. This adds the
missing rule and lets cool correctly answer the following query:

    $ ./coalg.native sat CL --agents '1' <<< '(~[{1}] p) & ~[{1}] ~p'
    unsatisfiable

Patch by Florian Widmann In order to fix the behaviour for the K*K
formulas

    [pi1]<R>c0 | [pi1]<S>c1 | [pi2]<T>c3
    [pi1]<R>c0 | [pi1]<S>c1 | [pi2]<T>c3 | [pi1][U]c4

Now one step in the debugger removes exactly one element from the queue
(if it's not empty). If this action empties the queue, nominals are
propagated.

This fixes an assertion that failed for the PML+K formula

   sat "({>= 3/5} (False + <R1> True & <R2> True) & {>= 2/5} ({>= 1/10} p0 & {>= 1/10} (~ p0) + False ) + False)"

which is satisfiable.