* report can be done using days as columns (#993)
* add a total column to the time report
* replace upper-right links by tabs to switch between details and report
* preserve date range filter when switching between details and report


git-svn-id: http://redmine.rubyforge.org/svn/trunk@1326 e93f8b46-1217-0410-a6f0-8f06a7374b81