Enhanced scenario manager

When working with Test runner /scenario builder, scenario is created by adding tests from the tests tree. The scenario is automatically saved to an XML file. It is read/write in the class directory and can be manage in the tests/scenarios directory.It can also be managed by the source control system.

Example:

<tests>
  <test NumberOfPacket="10000" class="traffic.tests.DummyBasicTest">testBridging</test> 
  <test NumberOfPacket="20000" class="traffic.tests.DummyBasicTest">testBridging</test> 
</tests>

Note that this scenario XML file is genrated automatically and can be edited manualy or by using the gui.