Keep the list item when it is NULL after eval.parent()

See merge request !205

Develop time attr units "month"

See merge request !204

Remove dimension 'lev' in ex1_12

See merge request !203

Replace is() with inherits()

See merge request !202

New release 2.2.1

See merge request !199

Subset input cannot be NULL

See merge request !200

Develop patc2022

See merge request !196

Develop CDORemapper warning

See merge request !198

Bugfix for improved Subset() that along cannot be NULL.

See merge request !197