Change londim and latdim to names in SelBox, create unit test and modify WeightedMean due to this change

Allow data to be non-numeric

See merge request !35

Improve WeightedMean

See merge request !36

Add Apply in WeightedMean, added checks, corrected documentation, code format, improved atomic function

Version bump to 0.2.1

See merge request !34

Version bump to 0.2.0

See merge request !32

Develop weight cells

See merge request !31

Use strftime more explicitly

See merge request !30

Enable CI/CD

See merge request !29

Develop-ShiftLon

See merge request !27

Bugfix for Subset() when the output dimension length is 1

See merge request !28