provide plugin hooks for blacklist checking functions.

doc/hook/check_channelallowed.bb

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+[h2]check_channelallowed[/h2]
+
+Called when checking the channel (xchan) black and white lists to see if a channel is blocked.
+
+Hook data 
+
+	array('hash' => xchan_hash of xchan to check);
+
+	create and set array element 'allowed' to true or false to override the system checks
+
+

doc/hook/check_siteallowed.bb

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+[h2]check_siteallowed[/h2]
+
+Called when checking the site black and white lists to see if a site is blocked.
+
+Hook data 
+
+	array('url' => URL of site to check);
+
+	create and set array element 'allowed' to true or false to override the system checks
+