This intends to add improvements that were done in new_ide but not merged
in master yet.
In particular, this merges
- the commit for interruption of provers in why3server.
- several counterexamples improvements:
  * choice of pretty printing for float counterexamples
  * countereamples parsing of lowercase "lambda"
- itp_server/controller_itp improvements:
  * error handling in itp_server (any_from_node_ID is now option)
  * reformating of controller_itp queues as record instead of tuples
  * choice to always give a new goal with the automatic function that gets
next goal

Conflicts:
	bench/ce/algebraic_type_CVC4,1.5.oracle
	bench/ce/algebraic_type_Z3,4.6.0.oracle
	bench/ce/array_records_CVC4,1.5.oracle
	bench/ce/array_records_Z3,4.6.0.oracle
	bench/ce/arrays_CVC4,1.5.oracle
	bench/ce/arrays_Z3,4.6.0.oracle
	bench/ce/floats_CVC4,1.5.oracle
	bench/ce/floats_Z3,4.6.0.oracle
	bench/ce/if_decision_branch.mlw
	bench/ce/if_decision_branch_CVC4,1.5.oracle
	bench/ce/if_decision_...