Add script to check rad length values in geo files set

- If git argument given or none, script check all new geo files introduced by an eventual hash change compared to upstream/master
- if all argument given, check all geo file in local copy
- if main argument given, check all geo file in local copy except mcbm ones
- If other argument, use it as a tag to restrict the list of checked geo from local copy (e.g. using mcbm checks only all mCBM geometries)
- Also add gitignore for macro geometry folder
- Add instructions on new script in README file