request #7177 - PhpWiki and PHP 5.4

replaces the use of old session_* functions with the $_SESSION array in
the Request.php file of phpwiki, making it works with PHP 5.4

Signed-off-by: Nicolas Lafont - WDMédia <nicolas.lafont@wdmedia.net>

Change-Id: I7823dbdcfc05d5a113ca11daa0ad80c9cb3af40e
tasks #7305: Enable mediawiki plugin compatibility view

- update /etc/tuleap/plugins/mediawiki/etc/mediawiki.inc for it to be used
- or re-install plugin

Change-Id: Ia1c2af5b4ae69cf6b6601f2c7a709c296489c874
Merge commit 'refs/changes/47/2847/1' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  tasks #7305: Enable mediawiki plugin compatibility view

Change-Id: Ia7c1e6aedb7e46b22e38570091bc5c9632f9aecc
This is Tuleap 7.3.99.33

Change-Id: I2e9181cc7e97212d5f15cf04eec6788edb139d96
Merge commit 'refs/changes/58/2758/3' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  request #7177 - PhpWiki and PHP 5.4
This is Tuleap 7.3.99.34

Change-Id: I7350671af49b8d028219e0e0f193bc7ea252143d