====================
Implementation notes
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:Version: $Revision: 1.3 $

[see also the roundup package docstring]

There have been some modifications to the spec. I've marked these in the
source with 'XXX' comments when I remember to.

In short:
 Class.find() - may match multiple properties, uses keyword args.

 Class.filter() - isn't in the spec and it's very useful to have at the Class
    level.
 
 CGI interface index view specifier layout part - lose the '+' from the
    sorting arguments (it's a reserved URL character ;). Just made no
    prefix mean ascending and '-' prefix descending.

 ItemClass - renamed to IssueClass to better match it only having one
    hypderdb class "issue". Allowing > 1 hyperdb class breaks the
    "superseder" multilink (since it can only link to one thing, and we'd
    want bugs to link to support and vice-versa).

 templates - the call="link()" is handled by special-case mechanisms in my
    top-level CGI handler. In a nutshell, the handler looks for a method on
    itself called 'index%s' or 'item%s' where %s is a class. Most items
    pass on to the templating mechanism, but the file class _always_ does
    downloading. It'll probably stay this way too...

 template - call="link(property)" may be used to link "the current node"
    (from an index) - the link text is the property specified.

 template - added functions that I found very useful: List, History and
    Submit.

 template - items must specify the message lists, history, etc. Having them
    by default was sometimes not wanted.

 template - index view determines its default columns from the template's
    <property> tags.

 template - menu() and field() look awfully similar now .... ;)

 roundup.py - the command-line tool has a lot more commands at its disposal

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