[yt-dev] Issue #1075: Switch HaloCatalog main loop to loop over io chunks (yt_analysis/yt)

[Britton Smith]

New issue 1075: Switch HaloCatalog main loop to loop over io chunks
https://bitbucket.org/yt_analysis/yt/issues/1075/switch-halocatalog-main-loop-to-loop-over

Britton Smith:

The loop over all halos in the HaloCatalog currently requires all processors to have the entire list of halos.  This should be changed such that process groups work only on a single io chunk.  Currently, only one io chunk exists even when the halo catalog is saved to multiple files.  This needs to be reverted to one chunk per file first.