Prepare for tracker entries without priority. * Extend issues_to_quantities to count entries with priority 'None'. The regular classic template enforces a priority value, but some trackers don't, e.g. the 'fast-decomposed' variant used by Intevation (https://hg.intevation.de/roundup/fast-decomposed/) uses other fields for a scrum like workflow that show the order of issues as a float value. In order to get all issues, we also have to collect them. Implement it in a backwards compatible manner for save_stats_in_db() by a keyword argument that is off by default. This is just a preparation as the database must also accept an additional column. * Cleanup some superfluous whitespace, remove an unused import and add copyright 208 year.

--- a/README.creole	Sun Jan 31 15:41:35 2016 +0100
+++ b/README.creole	Fri Jul 06 17:36:21 2018 +0200
@@ -7,7 +7,7 @@
 === Notes
 
 When migrating to 3:99c68ebfb3b9, Nov 30 17:46:22 2015
-you need to add the print statements for the content-type header 
+you need to add the print statements for the content-type header
 to all of your cgi scripts.
 
 Bottledash may have a fork
@@ -19,5 +19,5 @@
 
 === Included
 
-http://d3js.org/    	initially used with 3.5.5
+http://d3js.org/    initially used with 3.5.5
   """Library released under BSD license. Copyright 2015 Mike Bostock."