add a warning and hide the edit-link for uneditable content.
add failing test to confirm that the ModificationDate is changed on migration when content of folders is migrated (also when the folders containing the content is migrated)
add convenience-method to add the browser-layer to the request
Fix #62: Keep ModificationDate during migration.
add test for the viewlet warning about uneditable content
Modernize robot tests
fix regression coming from plone.dexterity now having notifyModified
add i18n-domain
Merge branch 'master' into #102_warning_for_uneditable_content
Merge pull request #119 from plone/#102_warning_for_uneditable_content

add warning for uneditable content (fixes #102)