Removed the top-level iptest.py and INSTALLED logic....
Removed the top-level iptest.py and INSTALLED logic.
Fernando's branch introduced the ability to run the test suite
from a top-level iptest.py script. This allowed IPython to be tested
without installation. The implementation was fragile and we also
decided that we *want* people to install IPython as part of testing
it, so we removed this feature.
