fix #245: do not send mails to a person twice if he/she is delegate and editor.
Merge pull request #395 from karyon/fix_duplicate_mail_245

fix #245: do not send mails to a person twice if he/she is delegate and editor.
refactor the email recipient handling
fix #295: add an option to send emails to the responsible person.
Merge pull request #396 from karyon/email_to_responsible_295

add option to send emails to the responsible person, fixes #295
remove mysql from the vagrant vm
consolidate kerberos settings
use the newer, safer way to describe patterns in urls.py
Merge pull request #397 from karyon/mysql_kerberos_urlpatterns

Mysql kerberos urlpatterns
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)
fix a few of landscapes high issues. level stays at medium as i disagree with too many of the issues.