Update 'sptools' submodule to 99c18569ee34
Bump version to 0.6.1 and update ChangeLog
Merge pull request #5 from thwill1000/thwill-alpha5 Merge thwill-alpha5 branch into main
Update ChangeLog
Merge pull request #2 from thwill1000/thwill-alpha3 2022.01.00 alpha 3