Fix indicated sort order for numeric columns
Previously, the ordering function was purposely inverted to ensure a certain initial sort order for numeric columns. However, this causes the wrong sort indicator icon to be displayed. The desired initial ordering can instead be adjusted by exposing Qt::InitialSortOrderRole in the ProcessModel.
The indicator icon is now consistent with how other applications (e.g. Dolphin) behave: It's a rotated "greater than" sign that compares elements at the top with elements at the bottom. More importantly, it is now self-consistent within ksysguard (whereas before, ^ indicated alphabetically ascending for textual columns but numerically descending for metrics!).
Before:
After:
Edited by Tony Wasserka