[prep-release-3.1.0-a1] Update version to 3.1.0-a1
[prep-release-3.1.0-a1] Update changelog with 3.1.0-a1 changes
[prep-release-3.1.0-a1] Only build packages for the latest olympus versions
[ticket/11918] Make sql_freeresult() consistent across all DB drivers

PHPBB3-11918
[ticket/11919] Remove extra argument to notification manager's sql_fetchfield()

PHPBB3-11919
Merge remote-tracking branch 'noxwizard/ticket/11918' into prep-release-3.1.0-a1

* noxwizard/ticket/11918:
  [ticket/11918] Make sql_freeresult() consistent across all DB drivers
Merge remote-tracking branch 'noxwizard/ticket/11919' into prep-release-3.1.0-a1

* noxwizard/ticket/11919:
  [ticket/11919] Remove extra argument to notification manager's sql_fetchfield()
[prep-release-3.1.0-a1] Update changelog with the latest changes
Merge remote-tracking branch 'p/prep-release-3.1.0-a1' into develop

* p/prep-release-3.1.0-a1:
  [prep-release-3.1.0-a1] Update changelog with the latest changes
  [ticket/11919] Remove extra argument to notification manager's sql_fetchfield()
  [ticket/11918] Make sql_freeresult() consistent across all DB drivers
  [prep-release-3.1.0-a1] Only build packages for the latest olympus versions
  [prep-release-3.1.0-a1] Update changelog with 3.1.0-a1 changes
  [prep-release-3.1.0-a1] Update version to 3.1.0-a1