problem and to make a first step toward getting rid of evil
__getstate__.

to get around acquisition problem and to make a first step toward
getting rid of evil __getstate__.

convert to extension classes to make permission machinery
work properly.  This needs some more thought.

convert to extension classes to make permission machinery
work properly.  This needs some more thought.

Moved a bunch of logic up from Folder.

Moved many facilities up to ObjectManager.

Note that the previous check in also included a rename of
PrincipiaFnd to ZopeFind (with PrincipiaFind retained as an alias).

convert to extension classes to make permission machinery
work properly.  This needs some more thought.

(effectively) inheriting permissions settings.
That is, a class' permission settings are the union of whatever
settings it has with settings in all base classes.

raised.  fixed to return null

regression.

named link...

and __call__ method (as alias to index_html) for DTML
scripting.

as:

  "whatever", :file_in_same_dir

or

  "whatever"::file_in_same_dir

.__init__(): relax the second gsub, using a '*' instead of a '+', so
the stuff before the ':' can be missing, and also do postprocessing so
any resulting '<a href=":file_in_same_dir">'s have the superfluous ':'
removed.  *Seems* good!