Release 2024.4

Prepared release 2024.4, changed version number and adapted documentation.

Releasing version 2024.3

Updated version  and description in documentation, updated
version in GUI

Prepared release 2024.2

Update the version number and the documentation for the release.

Release 2024.1

Adding tree-field and data-item-field documentation. Updated history.
Changed version number for release in all documents.

Release 2023.2

Prepared files and documentation for release 2023.2

Release 2023.1

Updated documentation, updated release number in GUI.

Release 2022.1

Changed release information for 2022.1. Small changes in
Tutorial.trt too.
 cd /home/jacob/development/treetime

Release 2021.9

Made changes to release version 2021.9

Release 2021.8

Prepared the 2021 August release.
All version numbers updated, release notes updated.

Merge branch 'master' of https://github.com/jkanev/treetime