* develop-olympus:
[ticket/11538] Add optional switch as argument to hex colour validation
[ticket/11538] Modify test colour values
[ticket/11538] Limit comment in acp_groups to 80 characters per line
[ticket/11538] Move group ID into abstract test class and add more test cases
[ticket/11538] Merge calls to validate_data() in acp_groups
[ticket/11538] Rename phpbb_validate_colour to phpbb_validate_hex_colour
[ticket/11538] Use abstract class for functional test cases for group colour
[ticket/11538] Add function phpbb_validate_colour for validating colours
[ticket/11538] Make sure regex doesn't allow multiple color values
[ticket/11538] Add tests for acp group manage page
[ticket/11538] Simplify colour value check and remove support for '#'
[ticket/11538] Fix incorrect regex and test for duplicate # in color string
[ticket/11538] Use regex for testing color value and improve tests
[ticket/11538] Make sure group color can't exceed maximum of 6 characters
Conflicts:
phpBB/includes/functions_user.php
phpBB/styles/prosilver/template/ucp_groups_manage.html
06379aece8