- Fix the export of the GR2M model diagram PNG file in the GUI launched by `ShinyGR()`. ([#40](https://gitlab.irstea.fr/HYCAR-Hydro/airgrteaching/-/issues/40))
- bug fixed in the GUI launched by `ShinyGR()`, it is possible to the export the GR2M model diagram PNG file again. ([#40](https://gitlab.irstea.fr/HYCAR-Hydro/airgrteaching/-/issues/40))
- bug fixed in `SimGR()` which can now simulate a period with no observed flow. Previously, it could only be run in this case when the observed flow was missing from the output of `PrepGR()` on the whole period and not just on a subperiod. ([#43](https://gitlab.irstea.fr/HYCAR-Hydro/airgrteaching/-/issues/43))
#### User-visible changes
- add explanation of the use of the GR5H model in the `PrepGR()` help page. ([#41](https://gitlab.irstea.fr/HYCAR-Hydro/airgr/-/issues/41))
- the text relating to the GR2M model in the 'GUI Help' image displayed by the GUI launched by `ShinyGR()` is corrected. ([#42](https://gitlab.irstea.fr/HYCAR-Hydro/airgr/-/issues/42))
- replace the use of `class()` by `inherits()` in order to test the classes of inputs in all functions. ([#45](https://gitlab.irstea.fr/HYCAR-Hydro/airgr/-/issues/45))
#### Version control and issue tracking
- automatic tests implemented in the package. ([#44](https://gitlab.irstea.fr/HYCAR-Hydro/airgr/-/issues/44))
-Fix`ShinyGR()` when the date column of `ObsDF` has another name as 'DatesR'. ([#38](https://gitlab.irstea.fr/HYCAR-Hydro/airgrteaching/-/issues/38))
-bug fixed in`ShinyGR()` when the date column of `ObsDF` has another name as 'DatesR'. ([#38](https://gitlab.irstea.fr/HYCAR-Hydro/airgrteaching/-/issues/38))
#### User-visible changes
-The `as.data.frame` S3 methods have been set for classes `PrepGR`, `CalGR` and `SimGR`. ([#39](https://gitlab.irstea.fr/HYCAR-Hydro/airgrteaching/-/issues/39))
-The useless `airGRt` class and the `as.data.frame.airGRt` S3 method no longer exist ([#39](https://gitlab.irstea.fr/HYCAR-Hydro/airgrteaching/-/issues/39))
-the `as.data.frame` S3 methods have been set for classes `PrepGR`, `CalGR` and `SimGR`. ([#39](https://gitlab.irstea.fr/HYCAR-Hydro/airgrteaching/-/issues/39))
-the useless `airGRt` class and the `as.data.frame.airGRt` S3 method no longer exist ([#39](https://gitlab.irstea.fr/HYCAR-Hydro/airgrteaching/-/issues/39))
-Fix`plot.PrepGR()` when all `Qobs` are missing. The function now displays an empty plot for the observed discharges ([#35](https://gitlab.irstea.fr/HYCAR-Hydro/airgrteaching/-/issues/35))
-bug fixed in`plot.PrepGR()` when all `Qobs` are missing. The function now displays an empty plot for the observed discharges ([#35](https://gitlab.irstea.fr/HYCAR-Hydro/airgrteaching/-/issues/35))