mod_groups_internal: Add flag to indicate when a linked MUC has been deleted
In theory this shouldn't happen, but it could (and apparently does).
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summary: Set process name to prosody
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This module sets the process name to `prosody` so it shows up as such
instead of `lua` in process management tools.
To use this module, you'll need the proctitle Lua library:
<https://github.com/hoelzro/lua-proctitle>