Merge pull request #222 from 4teamwork/lg-ldap-util-case-insensitive-check-for-user-obj-classes

ldap_util: Make check for user object classes case-insensitive.
Added french translation by I. Anthenien.
Merge pull request #223 from 4teamwork/lk_fr_translation

Added french translation by I. Anthenien.
Removed IMailInAddress behavior. Not needed any more with ftw.mail 2.0.
Provide an IntIdResolver adpater to generate Dossier Mail-In addresses

based on IntIds, and use it instead of the old implementation.
Removed og.mail IMailSettings registry interface (now done in ftw.mail).

Added upgrade step to migrate settings to ftw.mail's IMailSettings and
remove old og.mail IMailSettings.