Rich pixel clustering improvements

Various improvements to the pixel clustering algorithm.

Requires LHCb!1331 (merged)

added 4 commits

• e0486c1b...30e5bc42 - 3 commits from branch lhcb:master
• 2a83ebb9 - Merge branch 'master' of ssh://gitlab.cern.ch:7999/lhcb/Lbcom into RichPixelCluster-OptimiseSizeOne

Compare with previous version

unmarked as a Work In Progress

changed title from WIP : Rich pixel clustering improvements to Rich pixel clustering improvements

changed the description

• [2018-05-30 00:16] Validation started with lhcb-lcg-dev3#540
• [2018-05-30 00:17] Validation started with lhcb-clang-test#968
• [2018-05-30 00:18] Validation started with lhcb-head#1869
• [2018-05-30 00:18] Validation started with lhcb-lcg-dev4#540
• [2018-05-30 00:18] Validation started with lhcb-tdr-test#166
• [2018-05-30 00:18] Validation started with lhcb-gaudi-head-py3#169
• [2018-05-30 00:18] Validation started with lhcb-gaudi-head#1882
• [2018-05-30 01:45] Validation started with lhcb-lcg-dev4#540
• [2018-05-30 02:54] Validation started with lhcb-tdr-test#166

merged

mentioned in commit 0bd82c98

mentioned in merge request Brunel!422 (merged)

mentioned in commit Brunel@7deed369