Missing method for small generating set for non-libsemigroups types

[james-d-mitchell]

Looking at PR #720 we realised that the option small isn't being honoured any longer for semigroups that satisfy CanUseGapFroidurePin.

gap> S := FreeBand(3);
<free band on the generators [ x1, x2, x3 ]>
gap> S := Semigroup(AsList(S), rec(small := true));
#I  limit = 18446744073709551615
#I  found 9 elements, 3 rules, max word length 1, so far
#I  found 21 elements, 3 rules, max word length 2, so far
#I  found 39 elements, 9 rules, max word length 3, so far
#I  found 69 elements, 9 rules, max word length 4, so far
#I  found 111 elements, 15 rules, max word length 5, so far
#I  found 147 elements, 39 rules, max word length 6, so far
#I  found 159 elements, 45 rules, max word length 7, so far
#I  found 159 elements, 45 rules, max word length 8, finished!
#I  elapsed time: 1,969μs
#I  limit = 8193
#I  found 1 elements, 1 rules, max word length 1, finished!
#I  elapsed time: 20μs
<semigroup with 159 generators>
gap>

[james-d-mitchell]

Resolved in v5.2.0