Test runner improvements

```
I think test runner needs to be made more in line with other test frameworks.

- Nested suites don't nest in the tree, so finding the right one will be
very painful if you have hundreds of tests

- Option to show only failed tests

- Increase view area of the stack trace, change font to monospaced and
increase font size

- Option to filter out reflex unit calls in the stack trace to remove
visual garbage

- Move the progress bar on top, stretch across and increase size for
greater visual impact

```

Original issue reported on code.google.com by `alex.gor...@gmail.com` on 15 May 2008 at 5:26