Tags

Release notes:
- Fixed MultiStationObservation.all_connected
- Renamed SDPPacket.upcast to downcast

Release notes:
- Added iterator to Receiver classes
- Added antenna_field_index to packet header

Release notes:
- HDF5 attributes: Moved frequency_band and rcu_\* from header to matrix
- HDF5 attributes: Replaced subband_frequencies by the smaller subband_frequency_range
- HDF5 attributes: Removed superfluous nyquist_zones and spectral_inversion attributes
- Better error handling when writing HDF5 files and attributes

Release notes:
- Fix: read correct attribute for the frequency bands