[ticket/11663] Make generate_text_for_storage return the errors.

generate_text_for_storage does not return anything, all returned values are outputted using the parameters so this uses the returned value with the same idea as many C language functions where the returned value is if all went well or not and if it didn't what went wrong.

PHPBB3-11663
[ticket/11663] Add the doc block about the return value.

generate_text_for_storage does not return anything, all returned values are outputted using the parameters so this uses the returned value with the same idea as many C language functions where the returned value is if all went well or not and if it didn't what went wrong.

PHPBB3-11663
[ticket/11663] Add the doc block about the parameters.

PHPBB3-11663
[ticket/11920] Add MariaDB environment to Travis-CI.

PHPBB3-11920
[ticket/11920] Have to use empty root password otherwise db creation fails.

PHPBB3-11920
[ticket/11921] Improve appearance of Notifications in linklist

PHPBB3-11921
[ticket/11921] Improve appearance of PM notifications in linklist

PHPBB3-11921
Merge pull request #1780 from bantu/ticket/11920

[ticket/11920] Add MariaDB environment to Travis-CI.
Merge remote-tracking branch 'github-phpbb/develop-olympus' into develop

* github-phpbb/develop-olympus:
  [ticket/11920] Have to use empty root password otherwise db creation fails.
  [ticket/11920] Add MariaDB environment to Travis-CI.

Conflicts:
	.travis.yml
[ticket/11920] Actually call travis/setup-mariadb.sh.

PHPBB3-11920
[develop] Update version to 3.1.0-a2-dev
[ticket/11921] Remove "l_" from non-lang variables

PHPBB3-11921
[ticket/11926] Fix plupload migration dependency.

PHPBB3-11926
Merge pull request #1783 from bantu/ticket/11926

[ticket/11926] Fix plupload migration dependency.
[ticket/11920] Manually purge mysql-common.

PHPBB3-11920
[ticket/11920] Print MariaDB version after successful setup.

PHPBB3-11920
[ticket/11924] Bring layout of events.md to one style

PHPBB3-11924
[ticket/11924] Add script to export events.md with wiki markup

PHPBB3-11924
[ticket/11924] Add version info of template events to events.md

PHPBB3-11924
[ticket/11924] Reduce unneccessary load

PHPBB3-11924