Fixes for script auto-documentation.

- Fixing the parts of the `make restdoc` and `make doc` process that were
  broken by the last Bro script re-organization

- Generated documentation for Bro scripts derived from BiFs now use the
  original BiF source file as the "original source file" link

- Renaming of the internal POLICYDEST definition and other misc places that
  refer to "policy" scripts; that terminology doesn't make total sense now

- Added a documentation blacklist reminder test that will fail if there's
  scripts that are blacklisted from being documentated because they're still
  in progress

- Some minor Bro script changes to fix small @load dependency errors

Addresses #543

scripts/policy/frameworks/communication/listen-clear.bro

@@ -1,5 +1,7 @@
 ##! Listen for other Bro instances to make unencrypted connections.
 
+@load base/frameworks/communication
+
 module Communication;
 
 export {

scripts/policy/frameworks/communication/listen-ssl.bro

@@ -1,5 +1,7 @@
 ##! Listen for other Bro instances and encrypt the connection with SSL.
 
+@load base/frameworks/communication
+
 module Communication;
 
 export {

scripts/policy/frameworks/control/controller.bro

@@ -1,3 +1,4 @@
+@load base/frameworks/communication
 
 module Control;
 
@@ -99,4 +100,4 @@ event remote_connection_handshake_done(p: event_peer) &priority=-10
 		# Signal configuration update to peer.
 		event Control::configuration_update_request();
 		}
-	}
+	}

scripts/policy/protocols/conn/scan.bro

@@ -1,4 +1,4 @@
-@load frameworks/notice
+@load base/frameworks/notice
 @load port-name
 
 module Scan;