Ability to sort columns

[feisley]

Provide the ability to sort the columns in the following ways:

1. Allow the default sort to be selected in the configuration
2. Allow the end user to dynamically re-sort the report by clicking on the column headers.

[blaubaer]

I'am not sure if it is possible to support this in a permanent way. The cause: Lucence engine and the structure of confluence is not very good optimized to handle this. :-/