Test result modification has been moved into its own class: TestResultModifier

Hooked up remove and reset buttons.
TestResult is now observable so that changes are reflected in the UI.
Removed a namespace prefix.
Modified how worst tests are displayed; changed agent stuff.
Added config file to be able to configure test agents on the fly. Also modified some xaml to show failed tests in red.
Added a comment to the default config file to show how to add test agents.