PDF: fix incompatible character encodings: UTF-8 and ASCII-8BIT (#13354)

Contributed by Jun NAITOH.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11637 e93f8b46-1217-0410-a6f0-8f06a7374b81
Fixed: subtasks don't resepect following/precedes relations on creation (#12968).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11640 e93f8b46-1217-0410-a6f0-8f06a7374b81
Fixed: Circular loop when using relations and subtasks (#8794).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11641 e93f8b46-1217-0410-a6f0-8f06a7374b81
Code cleanup.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11642 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merge branch 'master' of github.com:redmine/redmine
config tabs/settigns/custom_fields