[Dev] Query improvements

[Ted Leung]

I've just checked in a series of changes to queries:

* Queries are now Items.
    * They persist and they have an attribute called resultSet, which is 
a refcollection of the results.
    * This has caused some changes in the constructors
    * Calling the compile method is no longer necessary.  Instantiate 
the query and then iterate either
      on the query item or the resultSet attribute, as you prefer

* New way of specifying recursive kind queries
   In the past this was done by setting an attribute on the query item.
   John suggested an "inevery" keyword to indicate a recursive query, so 
you can use "inevery" instead
   of "in" in the "for" statement

* Initial support for monitors
   This means the code in the same view can be notified about query 
changes "immediately".
   You can look in repository/query/tests/TestNotification for sample 
monitor client code

I'll be updating the wiki documentation to match what I've described 
here.

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Ted Leung                 Open Source Applications Foundation (OSAF)
PGP Fingerprint: 1003 7870 251F FA71 A59A  CEE3 BEBA 2B87 F5FC 4B42