Allow "bin/bulk export" to merge multiple queries and accept more flexible flags master
Summary: Ref T13210. Minor usability improvements to "bin/bulk export": - Allow `--class task` to work (previously, only `--class ManiphestTaskSearchEngine` worked). - If you run `--query jXIlzQyOYHPU`, don't require `--class`, since the query identifies the class on its own. - Allow users to call `--query A --query B --query C` and get a union of all results. Test Plan: - Ran `--class task`, `--query A --query B`, `--query X` (with no `--class`), got good results. - Ran various flavors of bad combinations (queries from different engines, invalid engines, query and class differing, ambiguous/invalid `--class` name) and got sensible errors. Reviewers: amckinley Reviewed By: amckinley Maniphest Tasks: T13210 Differential Revision: https://secure.phabricator.com/D19738