Inform user at install time of minimal python requirements if not met. Fixes: https://bugs.launchpad.net/ipython/+bug/505090

Give good error message when starting tests if nose is missing.

Include iptest.py in MANIFEST so it gets shipped.

Doc updates to testing to reflect recent changes. Updated revnumber to push an updated testing release out for this branch.

Added %exit, %quit and %Quit as magics for consistency.

Make the test suite runnable without X11 connections. This fix makes the test suite work in settings like a screen session that can import but not initialize GTK.

Fix tests to return consistent results regardless of how they are called. Now, calling: - 'python iptest.py' from source dir or from src/IPython/testing should give the same results - 'python iptest.py IPython.SOMETHING' from either place should also give the same results.

Comment out accidentally left over 'raise'. This function promises NEVER to raise an exception, I was propagating it out while debugging some odd behavior with __builtins__ and left it accidentally in place.

Ensure that __builtin__ is always available and compute prompts from it. __builtins__ (note the s) can change from module to dict somewhat at random, see this for details: http://mail.python.org/pipermail/python-dev/2001-April/014068.html If this happened, our prompt computations could go out of whack in bizarre ways, I saw it happen for continuation prompts after loading pylab, for example. This change fixes it.

Do not call %run with quotes, since on Windows quotes aren't stripped. On Posix, shlex strips quotes from filenames, but not on Windows. So if we call %run "somefilename" on Win32, we get a 'file not found' error. This problem was appearing for the test suite on win32.