Item11594: SubscribePlugin needs better method to limit when to render the subscribe button

This really needs to be under tight admin control due to performance issues. See Item11326.

DISABLEDPLUGINS can be used, but overriding it in a topic could fail to include this plugin, resulting in issues. The admin should be able to specify which webs get the subscribe button without depending upon the DISABLEDPLUGINS setting.

• Add config parameter: $Foswiki::cfg{Plugins}{SubscribePlugin}{ActiveWebs} = '';
• Add a new context variable - SubscribePluginAllowed and change templates to use this context.
• Add setting SUBSCRIBEPLUGIN_ACTIVEWEBS ignored if the configuration parameter is specified.

-- GeorgeClark - 03 Mar 2012

Note, This change will cause an empty Subscribe link using 1.1.5 templates:

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The fix for 1.1.x is to edit the file templates/viewtopicactionbuttons.tmpl and change the context test from SubscribePluginEnabled to SubscribePluginAvailable

-- GeorgeClark - 09 Apr 2012

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