us from inteheriting from propertysheet classes that weren't meant to
be subclassed.  This fixes a problem with creating property sheets for
subclasses of bilt-in classes like Folder.

handled properly.

Now when a propertysheet is created, it is usable by anyone who
has "Manage properties".  I also got rid of the ineffective
"access contents information" permission, since this won't have an effect
until we add ZClass propertysheets with their own namespaces.

copy containers like ZClass method sheets.

Seems to be quite usable at this point.

(especially external methods) on instances that are not acquiring.

the user uses the auto-create options on the add Folder form.

has_role.

*unless* they internally reached the word threshold, at which point
they did their own commit and reset their counter.  So, the value
returned is allways less than the threshold.  This is so huge
documents get the benefit of subtransactions, while lots of small
documents still get subtransacted too.

Catalog uses to decide when to commit a subtransaction.  More words:
less commits, faster speed, bigger memory footprint.  Less words: more
commits, slower speed, smaller memory footprint.

ballooning beyong the capacity of the machine.  Note: while mass
indexing, the memory footprint of Zope will get huge.  There is NO way
around this.  incrimentally index if you want your process to stay small.

First cut at a filtered product add list. This will keep objects out of the product add list for which the user does not have adequite permissions. This is implemented with a new method, 'filtered_meta_types' which returns all the meta_types for which a given user has permissions.

Store the permission in meta_types. This facilitates a filtered product add list. Note: control panel products and old style product registration do not add a permission key in the meta_types.

Added a has_permission method to user objects. This facilitates finding out if a user has access to a given object. Used for filtered product add list change.

handled specially.

tuples or lists of dictionaries.  This is somwhat useful for xml-rpc.