Missingbits

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- The act of importing missingbits will monkey-patch the Options object to
give you get_bool and get_list helpers.

- Stack: Default buildout options are no longer chosen over values set in the
stack.

- Stack: More buildout section variables can now be reset from the stack,
in particular the 'unzip', 'allow-picked-versions', 'newest' and
'allowed-eggs-from-site-packages' options.

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- Add a new recipe called Select. This can be used in conjuction with
isotoma.recipe.facts to customize your buildout based on the environment you
are running it in::

[facts]
recipe = isotoma.recipe.facts

[host-lucid]
somesetting = 1

[host-karmic]
somesetting = 2

[host]
recipe = missingbits:select
case = ${facts:lsb.codename}

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- Add a method for "peeking" at configruation files we haven't loaded yet. This
is useful if you have awkward inter-dependencies like your Plone config knows
its preferred version of Zope, but you can't load it till you have loaded
Zope!

You can use it like this::

value = stack.peek_unloaded("someconfig.cfg", "somesection", "somekey")

- Add a method for "peeking" into data that isn't fully evaluated - data that
is loaded but before you have called ``apply()``. You can use it like this::

value = stack.peek("somesection", "somekey")

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- Don't reset ``self.name`` when resetting things - this works around
``${:path}`` being invalid and the settings the stack uses shouldn't be changing
in flight - its just too weird!

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- Fix optional logic

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- Prior to the injection of any stack configuration, buildout._data is cleared
(with the exception of the buildout and versions parts), causing any already-
resolved parts to be re-resolved once the stack has been applied, and the
original configuration re-applied.