Merged r12906 from trunk to 2.4-stable

update Rails to 3.2.17

git-svn-id: http://svn.redmine.org/redmine/branches/2.4-stable@12908 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r12929 from trunk to 2.4-stable (#16177)

scm: mercurial: add one "closed" branch to test repository.

git-svn-id: http://svn.redmine.org/redmine/branches/2.4-stable@12933 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r12930 from trunk to 2.4-stable (#16177)

Mercurial 2.9 compatibility.

git-svn-id: http://svn.redmine.org/redmine/branches/2.4-stable@12934 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r12935 from trunk to 2.4-stable (#16177)

use Python getattr instead of hasattr.

git-svn-id: http://svn.redmine.org/redmine/branches/2.4-stable@12937 e93f8b46-1217-0410-a6f0-8f06a7374b81
Backported r12938 (#16169).

git-svn-id: http://svn.redmine.org/redmine/branches/2.4-stable@12940 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r12941 (#16161).

git-svn-id: http://svn.redmine.org/redmine/branches/2.4-stable@12943 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r12896 (#16081).

git-svn-id: http://svn.redmine.org/redmine/branches/2.4-stable@12946 e93f8b46-1217-0410-a6f0-8f06a7374b81
Updates for 2.4.4 release.

git-svn-id: http://svn.redmine.org/redmine/branches/2.4-stable@12949 e93f8b46-1217-0410-a6f0-8f06a7374b81
update submodule
Merge branch '2.4-stable' into ro-2-4