Exporters:
- Disambiguate exporter options:
* Renamed "--exporter.merge" -> "--exporter.hdf5.merge"
* Renamed "--exporter.merge.markers" -> "exporter.ensightgold.merge.markers"
* Renamed "--exporter.merge.timesteps" -> "exporter.mensightgold.merge.timesteps"
- Modified code to use renamed options
- Fixed export of data with several timesteps with hdf5 format
Merge branch 'develop' of github.com:feelpp/feelpp into develop