fix a code duplication and the bug that resulted from it
fix the "import_ad" script
eliminate most of landscape low issues (mostly code styling), raise strictness to medium
fix excel export colors again
eliminate a lot of landscape medium issues
small refactorings in the excel exporter
use messages.info() instead of messages.add_message(messages.INFO)
eliminate a few of landscapes high issues. level stays at medium as i disagree with too many of the issues.
Merge pull request #398 from fsr-itse/landscape_issues

Landscape issues