Merge remote-tracking branch 'origin/topic/jsiwek/smtp-refactor'

- While updating, I did some further work on the branch.

- New function in the base/utils/files for extracting filenames
  from content-dispositions.

- New script for entity excerpt extraction if you aren't interested
  in full extraction.  The data goes a log field too.

- Some renaming and reorganization of types.

- Updated tests to work with new code.

* origin/topic/jsiwek/smtp-refactor:
  Make the doc.coverage test happy.
  SMTP script refactor. (addresses #509)

Conflicts:
	doc/scripts/DocSourcesList.cmake
	policy/protocols/smtp/__load__.bro
	policy/protocols/smtp/base/__load__.bro

scripts/site/local.bro

@@ -43,4 +43,12 @@ redef signature_files += "frameworks/signatures/detect-windows-shells.sig";
 @load protocols/ssl/known-certs
 
 # Load the script to enable SSL/TLS certificate validation.
-@load protocols/ssl/validate-certs
+@load protocols/ssl/validate-certs
+
+# Uncomment this redef if you want to extract SMTP MIME entities for 
+# some file types.  The numbers given indicate how many bytes to extract for
+# the various mime types.
+redef SMTP::entity_excerpt_len += {
+#	["text/plain"] = 1024,
+#	["text/html"] = 1024,
+};