Katdal

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* Fix MODEL_DATA / CORRECTED_DATA shapes in h5toms
* Produce calibration solution tables in h5toms and improve error messages
* Autodetect receiver band on older RTS files

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* Support weights in file and improve vis / weights / flags API
* Support multiple receivers and improve centre frequency extraction
* Speed up h5toms by ordering visibilities by time
* Fix band selection and corr products for latest SDP (cam2telstate)
* Allow explicit MS names in h5toms

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* Initial release of katdal