Rationalise site/human_resource configs, make use of new
custom_configure resource hook for NYC. NYC uses hiearrchical org >
Facility dropdowns
Merge pull request #735 from oidualc/master

Remove incorrect module presence checks in event
MCOP: Add Locations to Tasks
hrm/pr_group: Tweaks to improve customisability (avoid stuff in default
preps as can't be overridden by custom_configure). NYC:Add VF for
chairperson in Groups list
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