Next release after v2.2.2

• Make return_vars an open option
• Load packages specified by Step() parameter "use_libraries" #176 (closed)
• Remove dependency on ClimProjDiags
• Bugfix longitude = 'all' transform missing point #163 (closed)

Others

• Update version number
• Update NEWS.md
• .Rbuildignore for testthat
• testthat edition 3