add option to add neighbouring muon hits for overlap checking

For testing

ideally to be merged into a patch of Moore/v55r12 (block 5, 6) and Moore/v55r13 (block 7, 8) for re-running reconstruction on the tracking efficiency lines for all data blocks (use v55r12 for block 1-4 to include bugfixes from !4047 (merged), !4050 (merged), !3663 (merged))

eventually to be merged into master for 2025 data taking