Add ability to stop test run: update interfaces, implement cooperative stop, still needs work on forced stop
Fix errors from rebase by eliminating forced stop code for now.
Add code for cancelling a test; finalize API
Increase wait time for cancellation test so it passes - temp fix till we correct problem with completion event
Add slow-tests to NAnt build
Remove WaitForCompletion from public API. Test events provide the same information.
Advance version to 2.9.7
Update msbuild script to include slow-tests
Fix compiler warnings
Fixes based on review of the pull request
Merge pull request #173 from nunit/feature-stop-run

Feature stop run