Fix gtk threading bug

fix small bug in traceback building

fix cd -b crash (patch by Ville)

- Add autocall 'smart' mode. - Add traits support to tab-completer.

util script

Fixes to: - embedding - traceback handling - tab completion Support for editing macros via %edit. Very conveninent.

add .meta namespace for extension writers.

- improve support for tab-completion under emacs - support N-M notation for slices in magics (includes endpoint)

for modules which define __all__, complete only on those. After a patch by Jeffrey Collins <jcollins_boulder-AT-earthlink.net>.

Pdb calling, pickle (under certain circumstances, connected with %run) and input history bug fixes. The last two were subtle problems I've known have been lurking for a long time, I hope I finally got it all.