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Merging: Allow overriding cross-section via command-line

Christian Gutschow requested to merge global_xsec_for_merging into release-3-1-x

Introduces -x (or --cross-section) argument in rivet-merge script that allows overriding the file-based cross-sections. This allows to reduce the following

rivet-merge -e -o merged.yoda file1.yoda file2.yoda ...
rivet-merge -o merged_scaled.yoda merged.yoda:1.234

to a single

rivet-merge -x 1.234 -e -o merged_scaled.yoda file1.yoda file2.yoda ...

If a value is supplied for both the global -x and to the individual file (file.yoda:1.23), the file-based value will take precedence.

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