Improved Issue#all_dependent_issues (#14015).

Patch by Jost Baron.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11827 e93f8b46-1217-0410-a6f0-8f06a7374b81
Replaces camelcase variable names (#14015).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11828 e93f8b46-1217-0410-a6f0-8f06a7374b81
Removes then's (#14015).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11829 e93f8b46-1217-0410-a6f0-8f06a7374b81
Removes some empty lines (#14015).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11830 e93f8b46-1217-0410-a6f0-8f06a7374b81
Replaces camelcase variable names (#14015).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11831 e93f8b46-1217-0410-a6f0-8f06a7374b81
Check inclusion only once (#14015).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11832 e93f8b46-1217-0410-a6f0-8f06a7374b81
Issue#children is never nil (#14015).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11833 e93f8b46-1217-0410-a6f0-8f06a7374b81