COB-205: Extend LOFAR measurementset with field to denote cobalt's doppler correction

Jan David Molrequested to merge
COB-205-add-doppler-to-ms into master

COB-205: Extend LOFAR measurementset with LOFAR_TOPOCENTRIC_FREQUENCY_CORRECTION column in the SpectralWindow table.

Closes COB-205

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