added possibility to configure ramdisk from initscript configuration file
fixed various unit tests.
addressed issue https://github.com/globaleaks/GlobaLeaks/issues/822
removed sha256sum from etag (https://github.com/globaleaks/GlobaLeaks/issues/822)
addressed issue https://github.com/globaleaks/GlobaLeaks/issues/822
added migration routines related to InternalFile sha removal