1.0 - Initial Release
1.1 - Bug fixes
1.2 - Added support for stock tech tree, without CTT installed
1.3 - Added support for the nodes from ModularLaunchPads
1.4 - Added support for Unkerballed Start and Probes Before Crew Tech Trees, updated Stock and CTT.
1.5 - Various tidy ups to all layouts, BetterEarlyTree support added, HideEmptyNodes support added.
1.6 - Added support for RP-1