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/base/protocols/mime/base.bro

@@ -1,7 +1,7 @@
 ##! The mime script does analysis of MIME encoded messages seen in certain
 ##! protocols (only SMTP and POP3 at the moment).
 
-@load utils/strings
+@load base/utils/strings
 
 module MIME;
 

scripts/base/protocols/mime/file-extract.bro

@@ -1,5 +1,5 @@
-@load protocols/mime/file-ident
-@load utils/files
+@load ./file-ident
+@load base/utils/files
 
 module MIME;
 
@@ -57,4 +57,4 @@ event mime_end_entity(c: connection) &priority=-3
 	if ( c$mime?$extraction_file )
 		close(c$mime$extraction_file);
 	}
-	
+	

scripts/base/protocols/mime/file-hash.bro

@@ -1,4 +1,4 @@
-@load protocols/mime/file-ident
+@load ./file-ident
 
 module MIME;
 
@@ -75,4 +75,4 @@ event mime_end_entity(c: connection) &priority=-3
 		NOTICE([$note=MD5, $msg=fmt("Calculated a hash for a MIME entity from %s", c$id$orig_h),
 		        $sub=c$mime$md5, $conn=c]);
 		}
-	}
+	}

scripts/base/protocols/mime/file-ident.bro

@@ -1,4 +1,4 @@
-@load protocols/mime/base
+@load ./base
 
 module MIME;