2017-12-13: Version 0.2.2, Cord Hockemeyer <cord.hockemeyer@uni-graz.at>

* R/kstructure.R: kstructure() now includes the empty set and the full item set.

* man/kstructure.md: Changed accordingly.

* R/plot.kstructure.R: Changes to reflect the (new) rules for suggested packages.

* Added a4wide.sry to vignettes directory
