[MonoDevelop] Presenting errors from custom commands in the error list

[Peter Hultqvist]

I have a custom build script that process a few files and report any
errors within them.
The files are in the project for easy editing.

Is it possible for the build command to generate error messages so that
they will show up in the error list?

I have already tried formatting the output similar to the error lines in
the compiler output without success.

My goal is to be able to double click the custom error to jump to the
file and line reported.