Fixes for VELO decoding

Giovanni Bassirequested to merge
tests_velo_data into master

This MR implements fixes for VELO decoding in the RetinaCluster case (the TELL40 firmware may leave blank spaces in the output, between actual clusters).
In addition VELO-only no-GEC and SP sequences are added.

FYI: @dcampora

Edited by Giovanni Bassi

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