Bug in blocks moveb_m

I believe this line:

b1 = helpers.find_if( lambda x: status(x,state,goal,'table') == 'waiting', helpers.all(state))

should be this one to prevent infinite recursion when a block is waiting but already on the table:

b1 = helpers.find_if( lambda x: status(x,state,goal,'table') == 'waiting' and state.pos[x] != 'table', helpers.all(state))

You can trigger the bug in the current code by reversing the order of key iteration in find_if.

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