[ESS] ess-tracebug

[Vitalie S.]

Ok, a minor bug  in regexps were corrected. Now, the ess-tracebug works with all
the error patterns known to me.

I collect the error patterns in the file error.data.R in the repository:
http://ess-tracebug.googlecode.com/svn/trunk/error.data.R .

If your error has source file references (like "at test.R#18: "), and it's
not highlighted, please send it to me. 

Best,
Vitalie.