Added "local roles" - the ability to give a user extra roles in the context of a particular object and its subobjects.

configurable number of seconds.

Added a safe 'range' function to the _ namespace. Contributed by Martijn Pieters. This function is limited to ranges of 1000 items or less.

Added a try tag with except blocks. This tag is based on work by Jordan B. Baker, and has been debugged and expanded to handle class-based exceptions.

"builtin" subclassable things.

Z classes that are subclassable.

It was possible to create methods that overrode properties,
which led to all sorts of strange behavior.

tweaked some other cosmetic things.

Fixed a doc string that said S_H was the same as I_H

Added a Unix path to cheapen the experience and remove that nasty DOS
path.

If the log file doesn't exist, create instead of failing

Updates an INSTANCE_HOME + 'ZServer.pid' file with the process
id.  To convieniently kill ZServer.  yes this work with wondows.

This is needed to make computed attributes work in ZTables,
but it might be better to expand the schema notion to accomidate
computed attributes.

moved become nobody stuff up to avoid writing PCGI files as root, and commented out PCGI to avoid PCGI serving by default.

host & port info in src properties.

content-type extensibility, and added logic to DMTLMethods/Documents to attempt
to set a content-type - otherwise ZPublisher will assume that xml is html and
do bad things with the content.