[PATCH] urltrans keyword handling cleanup

Hi all,

attached you can find patch that do cleanup of keyword handling in 
urltrans. This version convert keyword handling to use regex and allow 
keyword-regex to match the whole msg body instead of only first word.
This patch doesn't change behaviour of keyword handling except 
keyword-regex now match whole message body.

Additionaly, this patch adds escape code '%O' for DCS because it make 
sense to have DCS as whole instead of splitted into fields.

Comments and votes please.

Thanks,
Alex