overview.delay_repaint: avoid wasting GUI cycles via update_delay; prefer delay_first for prover initiated events -- avoid indefinite delay;

tuned;

merged

merged

Fixed bugs: - set_env no longer modifies pfuns field in theory data record. Instead, a copy of this field is now contained in the env field. - add_type_def now checks whether type associated with SPARK enumeration type is really a datatype with no parameters. - check_pfuns_types now properly strips off prefixes of proof function names.

merged

subtype preprocessing in Quickcheck; adding option use_subtype; tuned