provides much_v21d_jpsi geometry

Temporary geometry with shift of 5cm in the fifth absobers blocks and removal of its internal shield to allow for placement of the bellows.

Dear @f.uhlig, @p.-a.loizeau, @d.emschermann, @v.singhal,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

added CodeOwners label

mentioned in merge request !208 (merged)

This MR was superseded by !208 (merged)

It is further discussed in https://redmine.cbm.gsi.de/issues/2452

I therefore close this MR.

closed