Changes in libsemigroups 2.4.0 and 2.4.1:

• New features
  • Add replace_word presentation helper by @MTWhyte in #388
  • A library of examples of finite presentations was added by @MTWhyte.
• Issues resolved
  • Fix issue with replace_subword and the empty word by @MTWhyte in #384
  • build: add missing eigen3 to pkg-config file by @jengelh in #414
  • Fix Konieczny::add_generators by @flsmith in #420

Changes in gap-pkg-semigroups 5.2.0:

• This release contains a number of fixes and improvements, and one new feature, which is a method for IsSelfDualSemigroup and related functionality for semigroups satisfying CanUseFroidurePin:
  • m4/find_gap.m4: update by @fingolfin in #887
  • Adds method for IsSelfDualSemigroup and related functionality by @james-d-mitchell in #890
  • Fix some bugs by @james-d-mitchell in #889
  • Fix closure semigroup for non-libsemigroups types by @james-d-mitchell in #891
  • Add missing tests and doc for IsSelfDualSemigroup and friends by @james-d-mitchell in #892
  • Change -march=avx to -mavx by @james-d-mitchell in #896
  • Fix faulty usage of 0-simple RZMS translations code by @flsmith in #893
  • build: replace m4/ax_check_hpcombi by @james-d-mitchell in #897