addressed issue: https://github.com/globaleaks/GlobaLeaks/issues/112
removed duplicated function
removed version 7 of DB, fixed updater
implemented migration class for ReceiverFile, tested with db 5
fix against issue https://github.com/globaleaks/GlobaLeaks/issues/550
addressed issue https://github.com/globaleaks/GlobaLeaks/issues/548
added experimental hardcoded limit to avoid mail-floods https://github.com/globaleaks/GlobaLeaks/issues/552
addressed issue: https://github.com/globaleaks/GlobaLeaks/issues/112
implemented date extension and system comment scratch
extended Node and Comment with new fields
updated migration script 5to6 with Node and Comment
fixed format not converted since 5 to 6: https://github.com/globaleaks/GlobaLeaks/issues/515