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Add additional EW_SCHEME options for DY

Frank Siegert requested to merge rel-2-2-8-dy-ewscheme into rel-2-2-8

... in particular to allow specifying sinThetaW and mZ simultaneously at the expense of mW, similar to what is available on master (cf. 4e6565e1).

Three sub-options for specifying the QED coupling are introduced:

  • EW_SCHEME=20 for alpha(0), mZ, sinThetaW
  • EW_SCHEME=21 for Gmu, mZ, sinThetaW
  • EW_SCHEME=22 for alpha(mZ), mZ, sinThetaW

Note: The numbering is different from master but consistent with OpenLoops for now, and should be unified between OpenLoops and master for the future using strings instead of numbers.

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