Update reference frame offset for S6A once reprocessing have been completed

[remkos]

Reprocessing (all but) completed on 24 May '22. Now the reference frame offset can be properly calculated.

[andreustaylor]

Thanks for the update.
I am interested to keep up with the timing of when the new S6A offset will appear in the database, as it is a factor in how we configure an application.

[remkos]

The variables ref_frame_offset, ref_frame_offset_mle3 and ref_frame_offset_nr are now set to their appropriate values, for 6a.lr as well as 6a.hr.
See commit a948a7f.

Note that values for j3 have been (slightly) updated as well. Old and new values given below (in mm).

	JA3 old	JA3 new	S6A old	S6A Side A	S6A Side B
LR MLE4	-23.0	-22.6	0.0	-13.2	-11.9
LR MLE3	-9.0	-8.9	0.0	-17.5	-15.8
LR adaptive/NR	-48.0	-47.7	0.0	-19.6	-17.2
HR			0.0	-23.5	-21.5