swarm version 3.1.5

swarm version 3.1.4

3.1.3: Fix minor bugs, remove warnings, improve code and docs

swarm 3.1.2: Fix crash with fastidious mode

swarm 3.1.1: improved code and documentation, bugfix

swarm 3.1.0: improved code and documentation, bugfix, and macOS on ARM64

Merge branch 'swarm3'

Swarm 2.2.2: Fix endless wait in rare cases with multiple threads

SWARM 2.2.1: Fix memory allocation bug for d=1

Swarm 2.2.0: Updated version number and manual