added the filename handling back into the code

paperless.conf.example

@@ -63,7 +63,19 @@ PAPERLESS_CONSUMPTION_DIR="../consume"
 
 # Any email sent to the target account that does not contain this text will be
 # ignored.
-#PAPERLESS_EMAIL_SECRET=""
+PAPERLESS_EMAIL_SECRET=""
+
+# Specify a filename format for the document (directories are supported)
+# Use the following placeholders:
+# * {correspondent}
+# * {title}
+# * {created}
+# * {added}
+# * {tags[KEY]} If your tags conform to key_value or key-value
+# * {tags[INDEX]} If your tags are strings, select the tag by index
+# Uniqueness of filenames is ensured, as an incrementing counter is attached
+# to each filename.
+#PAPERLESS_FILENAME_FORMAT=""
 
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