EPE-96 Add Error/Warning code to Problems Window and marker tooltip

Fixes EPE-96

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #160 from GordonSmith/EPE-96

EPE-96 Add Error/Warning code to Problems Window and marker tooltip

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>