Revert "[#827] Add status group in time entries report."

This reverts commit 61a65d4624ff3a34dfb1e69ffb26695deda221e9.
Revert "Remove arbitrary limit on the Time Entry Report columns"

This reverts commit b8a7f2923a8f71bac8bde9a7cb04aa2636f663c6.
Extracted time report logic from the controller.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@8026 e93f8b46-1217-0410-a6f0-8f06a7374b81