use recommended syntax assertEqual instead of assertEquals
Display thread name and identity in debug_print
- add a wait_for_debuggee at the CSessionManager level, to allow waiting for the debuggee to be started

- small improvements to thread naming
Capture script stdout as the script is being debugged. Need to run it in unbuffred mode for this with a polling thread.
Add more synchronisation points using the new rpdb2Stdout features.

This makes the test suite compatible with the much slower PyPy