* Add opusreader2 source for hyperSpec: `opusreader2_to_hyperSpec()`
* Add opusreader2 source for hyperSpec: `opusreader2_to_hyperSpec()`
* Add opusreader2 source for ChemoSpec via hyperSpec: `opusreader2_to_ChemoSpec()`
* Add opusreader2 source for ChemoSpec via hyperSpec: `opusreader2_to_ChemoSpec()`
* Add support functions `.getDataBlockNames()` and `.getParamBlockNames()`.
* Add support functions `.getDataBlockNames()` and `.getParamBlockNames()`.
## Changes
* Fix call to `hyperSpec::new_hyperSpec` (was renamed to `hyperSpec::hyperSpec` in https://github.com/r-hyperspec/hyperSpec/commit/65c2c2d562769cf998d1ead950538089d3bf52d5).
*`to_ChemoSpec`-family of functions:
*`groups` is no longer a required parameter.
*`groups` now also accepts a single string or integer value,
which is then treated as the group for every sample.