Products-cmfquickinstallertool

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- Added an Extensions.Install module and an initial test suite.
[stefan]

- Added optional reinstall argument to install() and uninstall() method
[tiran]

- Enabled uninstall of deleted products by making the parser.py handle
missing product directories slightly more gracefully.
[tesdal]

- Fixed multiple register bug

QI doesn't assign an object to a product when it is already registered
for another product. This fixes bugs like the removal of the archetype
tool when a product was removed which itself had had installed Archetypes.
[tiran]

- Added afterInstall / beforeUninstall hooks:

out = afterInstall(portal, reinstall=reinstall, qi_product)
out, cascade = beforeUninstall(portal, reinstall, qi_product, cascade)
[tiran]

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- reinstall button

does the same as uninstall/install except that it does _not_ delete
objects that have been created on portal_level (portal_objects)

- product version info

added getProductVersion to the API
shows the version of the products
for installed products it also shows the version of the prod at install time

- By Andy McKay

Remove the except: pass from trying to make a External method, if there is
an error in the import log the error to ZLOG. Unfortunately there is a
string error we have to try and catch as well. That string error occurs
when the module cant be found, so we should ignore that.

- content type registry support

QuickInstaller now also tracks entries in the content_type_registry.

- if products have been removed from disc, mark them in the installed list as 'removed'

- added a ChangeLog :)