fix bugs in optimisation of lumi schema generation

Daniel Charles Craikrequested to merge
dcraik-lumi-gen-fix into master

Two bugs turned up in the optimisation step of the lumi schema generation

  • when counters were randomly removed to attempt to re-pack them, the offsets of remaining counters in the same word were not recalculated
  • when empty words were removed (because all of the counters inside them had been removed for re-packing) the indices of following words were not recalculated

Each of these bugs resulted in a rare chance for two counters to occupy the same bits within the lumi summary bank.

This MR fixes both bugs

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