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 as fix-attempt for memory-leak in `CloudDataSemseg`

change `rep_coord` calculation of 'syn_ssv' (the closest voxel to center mass) and 'cs_ssv' (the closest vertex to center of mass)

Currently, if the ssv contains no edges, the path length
will be zero and the path density is also returned zero.
This needs to be reviewed, however.

improve logging of cs extraction; @hashirah Please adapt the key for loading the numpy cache array in `filter_ssd_by_total_pathlength` once you added it

Overall improvements and fixes

Closes #39, #38, #36, #35, and #30

See merge request pschuber/SyConn!45