Add design doc about core module.

Fixing two small bugs in :mod:`IPython.kernel`. * In :mod:`IPython.kernel.launcher` we were not handling the lookup of ``job.exe`` properly on Windows if the HPC pack was not installed. * When :mod:`IPython.kernel.client` was imported, Twisted was giving warnings that we have silenced.

Bumping version to 0.11.apha1.

Merging work to get ready for first alpha release of 0.11. This mostly fixes bugs and tests in IPython.kernel.

Fixed bugs in IPython.kernel. * Removed :mod:`IPython.kernel.contexts` and :mod:`IPython.kernel.tests.test_contexts` and all code that used them. This was broken and needed to be removed. Also Enthought has a nice decorator that does this. * Fixed broken tests in :file:`test_multienginefc.py` and :file:`test_taskfc.py`. See https://bugs.launchpad.net/ipython/+bug/505358. * Changed ports number in :mod:`IPython.kernel.tests` to 10111 to avoid conflicts with users who are using the older 10105 ports. See https://bugs.launchpad.net/ipython/+bug/504515. * Fixed logic and bugs in :mod:`IPython.kernel.fcutils` and :mod:`IPython.kernel.clientconnector` related to how FURL files are validated and found. See https://bugs.launchpad.net/ipython/+bug/502790. * Fixed the unhandled :class:`DeadReferenceError`` exception that was happening in :mod:`IPython.kernel.multiengineclient' and :mod:`IPython.kernel.taskclient` when the controller died or restarted. Now we capture that error and raises a :class:`IPython.kernel.error.ConnectionError` that has a better error message. See https://bugs.launchpad.net/ipython/+bug/502796.

Merging from upstream trunk.

Merging Fernando's trunk (fp-trunk-dev) and Brian's edits (fp-review). This is a huge merge of months worth of work by Fernando and Brian. Some highlights: * The test suite has been ported to use the new APIs. * The test suite runs and passes on all platforms!!! * The IPython Sphinx directive has been updated to use the new APIs. * %history works again. * New %tb magic for showing last traceback. * Significant design improvements in the config loaders and applications. * Zillions of bugs fixed. * Completely new %pylab implementation that uses the new GUI support. This allows pylab to be enabled *at runtime*. * Many other things.

Changing revno before merge to trunk.

Fixing broken tests on win32. * Fixed tests related to get_home_dir. * Skipping test that involved killing a process in frontend.tests.test_process. * Added a few new tests for get_home_dir.

Minor cleanup in iptest.py and growl.py.

Various fixes to ipapp/ipcluster/ipengine/ipcontroller. * Fixed bugs in handling of ``reuse_furls`` and ``secure``. * Fixed ``--no-sep`` option. * Refactored how the :attr:`Application.config_file_name` is handled to make it clearer and more robust. * Tested all the apps.

Reverted decorators_trial.py and added command line docs. * Reverted :mod:`IPython.testing.decorators_trial.py` and everything that uses it. * Updated the command line usage information for ipcluster.

More work to address review comments. * Moved twisted import to top-level of :mod:`IPython.kernel.error` (r1333). * Added docstring about :meth:`InteractiveShell.load_extension` returning whatever the return value of :func:`load_ipython_extension` is. * Renamed the :attr:`user_config_ns` attribute to :attr:`user_ns_hidden` to better reflect what it does. * Moved the ``%HOME`` to the end of home directory options attemped in :func:`IPython.utils.path.get_home_dir` on Windows.

Reenabled the test test_asyncfrontendbase.py. For some reason this was being skipped by nose. Re-enabled and all tests pass.

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.

More work on the crash handler. * Made a subclass of :class:`IPython.core.crashhandler.CrashHandler` for each application we have. Each of these has a custom message and uses the name and email of the appropriate personf for that app. * Removed the :meth:`IPython.core.application.abort` method. * Made small changes to how the crash handler is instantiated in :class:`IPython.core.application.Application`. * Tested the crash handlers.

Fixed broken test in :mod:`IPython.utils.tests.test_path`.

Fixed bug in ultratb.py and io.py. Previously :class:`IPython.utils.io.Term` had a :meth:`Term.writeln` method that :mod:`ultratb.py` was using. But, when a real stream or files is used in :class:`IPython.utils.io.Term` it doesn't have this method, so we were getting an error when the IPython Sphinx directive was run. I removed this method and made :mod:`ultratb.py` use just ``write``.

Fixed small bug in ipcluster. Some of the subparsers in ipcluster were not having the argument_default=SUPPRESS option passed to them so there were getting None as a default, which was overriding the config system defaults.

Removed IPython.config.default from the default search path for ipcluster When ipcluster searches for config files, it should not look in IPython.config.default because we ALWAYS move the default config files to cluster_dir (which is still on the search path).