allow mask in data.uribl.zones

[axb-lists]

In the case of multi.uribl.com, for example allow usahe of
multi.uribl.com/2 to only query the "black" subset of the data

as per
http://www.uribl.com/about.shtml

X Binary On List

2 00000010 black
4 00000100 grey
8 00001000 red
14 00001110 black,grey,red (for testpoints)
255 11111111 your DNS is blocked from querying URIBL

[baudehlo]

Absolutely. Patches welcome for that :)

[baudehlo]

This is now fixed.