Small datepicker improvements (#13098).

Patch by Daniel Felix.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11335 e93f8b46-1217-0410-a6f0-8f06a7374b81
Fixed that project overview page shows trackers from subprojects with disabled issue module (#13076).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11336 e93f8b46-1217-0410-a6f0-8f06a7374b81