Add options to move ND-LAr and TMS

[mallory4869]

The PRISM geometry allows you to generate geometries with movable TMS and LAr detectors. Both detectors can be moved independently or together in the X-direction. Running make prism builds the geometries with default offsets (10000 mm for both TMS and LAr).
You can also specify shift offsets for TMS and LAr separately using the TMS_SHIFT and LAr_SHIFT parameters.
For example, make prism TMS_SHIFT="15000" LAr_SHIFT="20000" moves the TMS and LAr detectors to 15000 mm and 20000 mm, respectively. Note that the maximum movable distance for PRISM is 35000 mm.
A prism_nosand option is also available to build a significantly faster geometry. Running make prism_nosand builds the same movable geometry without SAND. Similarly, to specify custom offsets, use: make prism_nosand TMS_SHIFT="15000" LAr_SHIFT="20000".

[github-actions]

Geometry is ready for visual inspection at https://dune.github.io/dunendggd/

[ast0815]

This looks like a clever solution. Could you add the dynamically generated files to the .gitignore file so they do not accidentally get checked in?

Also, for the lines you modified, please remove the Commented out "alternative" dimensions. I doubt that anyone knows what they are for. In general: Comments should only remain in the code if they explain something. Just "old values" without context should be removed.

[mallory4869]

Thanks for your comments! I have updated the .gitignore file. Regarding your second point about the comments, I’m not sure I fully understand which lines you’re referring to. Could you please point me to the relevant file and lines? Thanks a lot!