mod_storage_xep0227: Update for XEP-0227 r1.1: Support for SCRAM, MAM, PEP

util.set: Add :contains_set() method

util.array: Add :slice() method + tests Behaviour follows the same logic as string.sub (so yes, 1-indexed).

util.stanza: Add :get_child_with_attr() + tests

mod_pubsub/pubsub.lib: Export config forms for use by other modules In this case I need them for 227 import/export.

mod_http_file_share: Fix traceback in global quota debug logging (thanks Martin) Error in util.human.units.format because of B(nil) when the global quota is unset.

util.prosodyctl.check: Remove stray debug print()

util.prosodyctl.check: Ignore unused "ok" variable [luacheck]

mod_http_file_share: Add optional global quota on total storage usage Before, maximum storage usage (assuming all users upload as much as they could) would depend on the quota, retention period and number of users. Since number of users can vary, this makes it hard to know how much storage will be needed. Adding a limit to the total overall storage use solves this, making it simple to set it to some number based on what storage is actually available. Summary job run less often than the prune job since it touches the entire archive; and started before the prune job since it's needed before the first upload.

util.prosodyctl.check: Refuse to do ojn test unless prosody is running Other tests don't require a running prosody and I forgot to start it when testing.