Validate properties specified for sorting and grouping in index views. Original patch from martin.v.loewis via: https://hg.python.org/tracker/roundup/rev/439bd3060df2 Applied by John Rouillard with some modification to properly identify if the bad property is a sort or grouping property. Tests added. Ideally we would never get bad sort/group properties but...

; This is a sample configuration file for roundup-server. See the
; admin_guide for information about its contents.
[main]
port = 8080
;hostname = 
;user = 
;group = 
;log_ip = yes
;pidfile = 
;logfile = 
;template =
;ssl = no
;pem =


; Add one of these per tracker being served
[trackers]
home = /path/to/tracker