Improve practical guide

See merge request !188

Develop return vars null reshape

See merge request !187

Modify time unit judgement to consider the time variable that doesn't have name 'time'.

See merge request !185

Bump version to 2.2.0-1 and update NEWS.md

See merge request !184

Remove the extra dimension in metadata reshaping

See merge request !183

Develop merge param check

See merge request !182

Develop multi dim dependency

See merge request !181

Fix metadata reshaping remaining issue

See merge request !180

Fix metadata reshaping when time dim is implicit and the split file dim array has time as a dimension

Develop reshape split metadata

See merge request !179