Improvements for Hive Performance and Status page

[ascheibe]

This ticket is for tracking some improvements for Hive.

• The GetTasks method of the Hive Dao on the server also loads the TaskDatas which contain the serialized Hive tasks. It should therefore be replaced by methods that do not load the task datas with the tasks.
• This improvement should also speed up loading of the the Hive Status page.
• Additionally the Hive Status page should show which users currently have waiting/calculating tasks.
• If it's easily possible, the Status page should also show which resources are currently allowed to calculate and the real resource utilization should be shown.

[ascheibe]

r9022 added a dao method which loads lightweight tasks instead of tasks. Therefore the task datas are not loaded which reduces memory consumption and improves performance when

• downloading tasks
• refresh automatically is checked in the Hive Job Manager
• loading the Hive Status page.

The Hive Status page now shows which users are currently calculating how many tasks.

[ascheibe]

r9023 added displaying of real cpu load and real available cores

[ascheibe]

r9025 added displaying statistics for groups

[ascheibe]

r9027 some minor graphical improvements

[ascheibe]

r9028 added link for all groups

[ascheibe]

r9033 Calculating/Waiting Tasks are now calculated for the selected resource

[ascheibe]

r9034 fixed naming

[ascheibe]

r9035 removed duplicate code

[ascheibe]

As discussed with mkommend, I'm setting this ticket readytorelease.