svn+ssh://svn.zope.org/repos/main/Zope/branches/2.12 r118262:118470

Fixes LP #628448.

Forward-port from 2.13 branch.

Dropped the direct dependencies on packages that have been factored out of the main Zope 2 tree. Make sure you declare a dependency in your own distribution if you still use one of these: ``Products.BTreeFolder2``, ``Products.ExternalMethod``, ``Products.MailHost``, ``Products.MIMETools``, ``Products.PythonScripts`` or ``Products.StandardCacheManagers``.

Avoid conflict error hotspot in PluginIndexes' Unindex class by using IITreeSets instead of simple ints from the start. Idea taken from ``enfold.fixes``. This optimizes the common case of FieldIndexes being used for a low number of unique values. The edge-case of having a FieldIndex for an unique value per document gets penalized, as it uses many more persistent objects. This really warrants a separate type of index.

copy the list of packages to initialize. install_package calls package_initialized which removes from the list

Windows, because xrange uses 32bit integers and __getslice__ gets 64bit integers

Changed policy on handling exceptions during ZCML parsing in ``Products``. We no longer catch any exceptions in non-debug mode. These days most products won't actually do anything useful if their ZCML is not loaded - it's no longer helpful to pretend to get a working instance. We'd rather fail early and visible.

Added a new BooleanIndex to the standard PluginIndexes, sponsored by Jarn AS and based on work in the Products.BooleanIndex distribution.