tagging release 1.20.0, refs #563
tagging release 1.19.0, refs #563
tagging release 1.18.0, refs #563
tagging release 1.17.0, refs #563
tagging release 1.16.0, refs #563
tagging release 1.15.0, refs #563
tagging release 1.14.1, refs #563
tagging release 1.14.0, refs #563
tagging release 1.13.0, refs #563
tagging release 1.12.0, refs #563
tagging release 1.11.0, refs #563
tagging release 1.10.0, refs #563
tagging release 1.9.2, refs #563
tagging release 1.9.1, refs #563
tagging release 1.9.0, refs #563
tagging release 1.8.0, refs #563
tagging release 1.7.0, refs #563
tagging release 1.6.0 refs #563
tagging release 1.5.0 refs #563
tagging release 1.4.0, refs #563