mod_muc_markers: replace configurable multi-marker tracking with better system Now tracks a single marker, but automatically applies rules from the XEP about "higher" markers implying "lower" markers - i.e. "displayed" implies "received". Still, just a single marker is tracked and synthesized at all times (the one configured with muc_marker_name).

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labels:
summary: Limit number of resources a user may connect
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Introduction
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This module lets you limit number of resources a user may connect.

Configuration
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After installing and adding the module to `modules_enabled` you can
specify a limit with `max_resources` which defaults to 10.