Rename erasmus to rigshospitalet (mpxv/rigshospitalet/2500/v1.0.0)

[bede]

Following discussion with Martin Pedersen, Matthijs Welkers and Anton van den Ouden, and @pvanheus, we understand that this scheme was created by Martin Pedersen while at Rigshospitalet in Copenhagen before distribution with other protocols.io authors. On this basis the name rigshospitalet was suggested and agreed, and Martin Schou Pedersen was added to the author list.

This PR therefore replaces references to erasmus with rigshospitalet in the scheme.

• Use generic MPXV as primer prefix instead of erasmus
• erasmus added as alias

The canonical name of the scheme therefore becomes:
mpxv/rigshospitalet/2500/v1.0.0

[pvanheus]

As per Bas Oude Munnik's email, we can remove the erasmus alias I think? I know it has (incorrectly) acquired that name but it is not in common use and seems to cause confusion.

[pvanheus]

As to the reference sequence - we note ON563414.3 as a reference but as per email discussions, Martin Schou Pedersen used an alignment of multiple sequences to generate the "reference" used for primer design. In the literature primers have been removed using cutadapt to trim from the ends: we need to be 100% sure that this reference is appropriate for the BED before merging.

[bede]

As agreed, merging to on basis of name change. If reference should be changed, this can be done in a future revision.