[ticket/13203] Add method for byte by byte comparison to drivers helper

PHPBB3-13203
[ticket/13203] Use string_compare method in passwords drivers

PHPBB3-13203
[ticket/security-159] Only show first 8 characters of login keys in UCP

SECURITY-159
[ticket/13205] Add a mark all messages read link to PM folders

PHPBB3-13205
[ticket/13205] Remove superfluous newline

PHPBB3-13205
[ticket/13205] Explicitly cast ids to integers and reformat SQL

PHPBB3-13205
Merge pull request #3058 from naderman/ticket/13205

[ticket/13205] Add a mark all messages read link to PM folders
[ticket/security-161] Add form token to styles management form.

SECURITY-161
Merge pull request #3 from phpbb/ticket/security-161

[ticket/security-161] Add form token to styles management form.
[prep-release-3.1.0-RC6] Update version to 3.1.0-RC6
[prep-release-3.1.0-RC6] Add migration for 3.1.0-RC6
[prep-release-3.1.0-RC6] Prepare Changelog
[prep-release-3.1.0-RC6] Add changelog for 3.1.0-RC6
[prep-release-3.1.0-RC6] Update phpBB Version for RC7 development