Add a fallback to the fully symbolic attractor detection if the NFVS search fails

[daemontus]

This is very straightforward: if the NFVS method produces more than attractor_candidates_limit candidate states, fall back to basic symbolic search using AEON.

This is not very common (hence I added an optional flag to enable this behavior which is off by default), but it does help with a few variants of model 002 and 079 where we would otherwise just get stuck on enumerating the attractor candidate states. However, it may be necessary to manually decrease the attractor_candidates_limit to get the full performance benefit (enumerating 100_000 candidates, which is the default, still takes a lot of time).

[github-actions[bot]]

Coverage Report

File	Stmts	Miss	Cover	Missing
biobalm
_pint_reachability.py	61	50	18%	24, 40–54, 69–93, 101–146
control.py	114	14	88%	107, 119, 125, 129, 134, 143–159, 477, 480, 493
interaction_graph_utils.py	52	6	88%	11–13, 151–152, 222–223
petri_net_translation.py	149	12	92%	22–26, 79, 136, 234, 308–309, 333–334, 343, 452
space_utils.py	132	20	85%	26–28, 104–110, 133–139, 347–350, 414, 462
succession_diagram.py	391	74	81%	6, 123, 213–218, 231, 278–285, 389–396, 413–414, 424, 430, 546, 633–639, 755, 758, 853–867, 898–916, 948, 958, 961, 1001, 1008, 1059, 1077, 1199, 1385, 1396, 1404, 1447, 1459, 1464, 1470
symbolic_utils.py	32	5	84%	10, 39–44, 100, 128
trappist_core.py	184	23	88%	14–18, 55, 57, 92, 215, 217, 219, 254–256, 276–282, 340, 342, 372, 420, 422
biobalm/_sd_algorithms
expand_attractor_seeds.py	60	7	88%	6, 28, 42, 109–114, 119
expand_bfs.py	28	1	96%	6
expand_dfs.py	30	1	97%	6
expand_minimal_spaces.py	42	3	93%	6, 28, 42
expand_source_SCCs.py	111	16	86%	11–13, 50, 69, 77, 82, 103, 112, 120, 131, 140, 143, 167, 179, 242–243
expand_source_blocks.py	121	20	83%	10, 30, 42–45, 57, 67, 74, 79, 82, 141, 167, 176, 210–211, 215, 225, 231, 240
expand_to_target.py	31	3	90%	6, 38, 43
biobalm/_sd_attractors
attractor_candidates.py	265	90	66%	13–15, 26–27, 93, 101, 107–108, 130, 152, 187, 193–204, 223, 239–320, 325, 329, 335, 341, 356, 383, 388, 392, 398, 400–438, 511, 582–583, 684
attractor_symbolic.py	159	32	80%	6–7, 37–38, 56, 65–81, 84, 89, 170, 183–187, 198, 207, 239, 274, 286–288, 297, 325, 331
TOTAL	2051	377	82%

Tests	Skipped	Failures	Errors	Time
359	0 :zzz:	0 :x:	0 :fire:	57.186s :stopwatch: