GiBUU weight in W2List

In order to provide more information from the actual GiBUU run used for writing the KM3NeT file, I suggest to write the GiBUU event weight also to the KM3NeT file. The definition of the w2list was applied from gSeaGen and the additional field will be added, which will conserve the full compatibility of the files.

added discussion io labels

requested review from @rgracia

assigned to @jschumann

added 2 commits

• 269bed3a - 1 commit from branch master
• 52d222f2 - Add gibuu weight to an additional field in w2list

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This field should cover all additional information from GiBUU -> merge

added 2 commits

• 850a0197 - 1 commit from branch master
• 6438abee - Add gibuu weight to an additional field in w2list

Compare with previous version

mentioned in commit 7a5a76ab

merged