Release on CRAN

v0.6.2 released on CRAN

Version 0.6.1 after publishing on CRAN

Merge branch '19-feature-request-feedback-control' into 'dev'

Resolve "Feature request: feedback control"

Closes #28, #30, #31, and #19

See merge request in-wop/airGRiwrm!11

release: v0.4.0

- Update README.md and DESCRIPTION

Merge branch '5-add-node-of-type-direct-flow-in-order-to-inject-or-wi…

…thdraw-flows-into-the-model' into 'master'

Resolve "Add node of type "direct flow" in order to inject or withdraw flows into the model"

Closes #5

See merge request in-wop/griwrm!5