use `select_related(related_names)` instead of deprecated `select_related(depth=1)` (bug 1023010)
Merge pull request #117 from cvan/1023010

use `select_related(related_names)` instead of deprecated `select_related(depth=1)` (bug 1023010)
Revert "Bug 1041873: Add mass deletion tool."

This reverts commit 70ab314f147a00b8b76b4fb835d3b2256c9ebf47.