[ticket/10917] Revert use of phpbb wrapper

PHPBB3-10917
[ticket/10917] Variable used only once so delete it

The variable $this->unequal_version was only used once
and only to display the version the package updates to.
To display the version it updates to makes no sense when
the update files just aren't meant to update from the
current version. (It's already shown in an error message)
So I deleted the variable from there.

Furthermore the use of version_compare makes the variable
useless in that context which is why I deleted the variable
from the whole file and replaced it in the relevant if statement
with the old comparison.

PHPBB3-10917
Merge remote-tracking branch 'Elsensee/ticket/10917-2' into develop-olympus

* Elsensee/ticket/10917-2:
  [ticket/10917] Variable used only once so delete it
  [ticket/10917] Revert use of phpbb wrapper
[ticket/11752] HTTP -> HTTPs in email/installed.txt

PHPBB3-11752
Merge remote-tracking branch 'bantu/ticket/11752' into prep-release-3.0.12

* bantu/ticket/11752:
  [ticket/11752] HTTP -> HTTPs in email/installed.txt
Merge branch 'prep-release-3.0.12' into develop-olympus

* prep-release-3.0.12:
  [ticket/11752] HTTP -> HTTPs in email/installed.txt
[ticket/11524] Add another isset() to mitigate "Illegal string offset 'limit'"

... on PHP 5.4 or higher.

PHPBB3-11524
[ticket/11753] Update MySQL upgrader schema data.

PHPBB3-11753
[ticket/11753] Remove ?> from MySQL Upgrader.

PHPBB3-11753
Merge remote-tracking branch 'bantu/ticket/11524' into prep-release-3.0.12

* bantu/ticket/11524:
  [ticket/11524] Add another isset() to mitigate "Illegal string offset 'limit'"
Merge branch 'prep-release-3.0.12' into develop-olympus

* prep-release-3.0.12:
  [ticket/11524] Add another isset() to mitigate "Illegal string offset 'limit'"
Merge remote-tracking branch 'bantu/ticket/11753' into prep-release-3.0.12

* bantu/ticket/11753:
  [ticket/11753] Remove ?> from MySQL Upgrader.
  [ticket/11753] Update MySQL upgrader schema data.
Merge branch 'prep-release-3.0.12' into develop-olympus

* prep-release-3.0.12:
  [ticket/11753] Remove ?> from MySQL Upgrader.
  [ticket/11753] Update MySQL upgrader schema data.