Merged rails-5.1 branch (#23630).
New permission: view news (#7068).
Patch by Felix Schäfer.
New Permission: View Forum (#4866).
Option to set a default assignee on each project (#482).
Changes the digest used for attachments to SHA256 (#25240).
Patch by Jens Kraemer.
Change extra_info to long text (#14626).
Patch by Go MAEDA.
Adds an index to attachments.disk_filename (#25022).
Adds an index on issues parent_id (#23987).
use symbol instead of string for 'position' in db migrate (#24013)
Adds an index on issue_id to changesets_issues (#24433).
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