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Reduce memory usage of sky map statistics

Leo Singerrequested to merge
leo-singer/ligo-followup-advocate:reduce-memory into master
  • Throw away distance information to disable memory-intensive credible volume calculations.
  • Refactor sky map reading so that we always retrieve the multi-resolution format in all three code paths that use sky maps.

The effect of this on memory consumption (tested by running /usr/bin/time -v ligo-followup-advocate compose S241210cw on leas-grid.ligo.caltech.edu) is that the memory consumption went from 1518 MB to 299 MB.

Closes gwcelery!1567 (closed).

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