Cosmetic cleanups: put all imports in a single line, and sort them alphabetically. This will make it easier to see/clean dependencies as we start copying stuff into chainsaw.

- Big iplib cleanups, moved all tab-completion functionality to its own module (IPython.completer). - Added support for 'quit/exit' doing the intuitively correct thing. - IPython doesn't depend on code.py anymore (it doesn't even import it). At this point it was only a matter of copying two methods. This gives us a standalone object which we can clean up/refactor at ease.

Indentation improvements: - cut-and-paste now works even with autoindent on (mostly: the readline history is still messed up, and I don't have access to the necessary hooks to fix that). - A single <tab> on an empty line now inserts a TAB key. This makes it easier to indent using tabs, as well as pasting code with tabs in it (now they don't get interpreted as completion requests).

harden reporting against failures for objects which break when dir() is called on them.

clean up debug messages left in by accident

Namespace fixes for embedded instances, as well as tab-complete enhancements in that context. Full details in changelog

- Fairly significant changes to include Vivian's patches for improved pdb support. Her original idea was kept in full, code reworked for compactness and better integration with the rest of ipython. - Added download_url arg to setup.py to support setuptools.

Fix mainloop() call form which was inconsistent across shell classes

Updated manpage and docs to clarify negated options usage. Thanks to Stefan van der Walt for the heads-up.

Put .rc attribute in instance earlier, too many methods expect this to be there and it could lead to weird runtime bugs (like the one fixed by the previous commit).