Better intro page concerning guest access (resolves #77)
Extended the time frame for the current incidents in the main page
Make sure that yii rbac/init can run several times
rbac: Include assignments.php - even if emtpy
Support for larger pictures as requested in  #78: 10mb pics are now allowed; pics are now resized on upload, pics in manage are medium size to preserve bandwith
Advice about pics being blurred as requested in  #78