Git commits in Moodle 2.7.6 by Andrew Davis

commit e742ba8b7e77d7b3c43089882f6fa37ccc32276b
Author: Andrew Davis <andrew@moodle.com>
Date:   Tue, 24 Feb 2015 16:18:06 +0800
Tag:    v2.7.6

MDL-49008 lang: dont preemptively delete lang packs when updating

commit 32f0ad84c65be1fd59dd2d295fbd45939854a467
Author: Andrew Davis <andrew@moodle.com>
Date:   Mon, 26 Jan 2015 04:25:14 +0800
Tag:    v2.7.6

MDL-48942 mod_survey: synced security checks in view.php and graph.php

commit a43200104c239ee2336552fd9ab0f3a0b8882df7
Author: Andrew Davis <andrew@moodle.com>
Date:   Tue, 20 Jan 2015 17:06:42 +0800
Tag:    v2.7.6

MDL-48910 core_block: user_can_addto() respects applicable formats