Merge branch 'new_ide' into master

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_branch_Z3,4.6.0.oracle
	bench/ce/int.mlw
	bench/ce/int32_CVC4,1.5.oracle
	bench/ce/int32_Z3,4.6.0.oracle
	bench/ce/int_CVC4,1.5.oracle
	bench/ce/int_Z3,4.6.0.oracle
	bench/ce/int_overflow_CVC4,1.5.oracle
	bench/ce/int_overflow_Z3,4.6.0.oracle
	bench/ce/jlamp0_CVC4,1.5.oracle
	bench/ce/jlamp0_Z3,4.6.0.oracle
	bench/ce/jlamp_array_CVC4,1.5.oracle
	bench/ce/jlamp_array_Z3,4.6.0.oracle
	bench/ce/jlamp_projections_CVC4,1.5.oracle
	bench/ce/jlamp_projections_Z3,4.6.0.oracle
	bench/ce/map_CVC4,1.5.oracle
	bench/ce/map_Z3,4.6.0.oracle
	bench/ce/real_CVC4,1.5.oracle
	bench/ce/real_Z3,4.6.0.oracle
	bench/ce/record_map_CVC4,1.5.oracle
	bench/ce/record_map_Z3,4.6.0.oracle
	bench/ce/records_CVC4,1.5.oracle
	bench/ce/records_Z3,4.6.0.oracle
	bench/ce/ref_CVC4,1.5.oracle
	bench/ce/ref_Z3,4.6.0.oracle
	bench/ce/simple_array_CVC4,1.5.oracle
	bench/ce/simple_array_Z3,4.6.0.oracle
	src/core/ident.ml
	src/core/ident.mli
	src/parser/parser.mly
	src/printer/alt_ergo.ml
	src/printer/smtv2.ml
	src/session/itp_server.ml
	src/transform/eval_match.ml
	src/transform/intro_projections_counterexmp.ml
	src/transform/intro_vc_vars_counterexmp.ml
	src/whyml/mlw_wp.ml
	tests/demo-itp.mlw