DDS4CCM_ — Supporting Content Filtered Topics

The current QueryFilter in the spec seems to match best to a QueryCondition.
But DDS also provides the ContentFilteredTopic support, that doesn't seem to
be available at the ccm-dds level, is this intended?

The resolution is to add on the reading-side DDS ports a filter attribute and a
basic port to change filter parameters when appropriate (this basic port will be
used in the port and provided in the associated mirrorport). This disposal implies
to add configuration attributes in porttype definitions.
In addition, for clarity purpose, the formerly named "filter" attribute on the Reader
interface is renamed "query" and inside the QueryFilter structure, the first field
(formerly "query") is renamed "expression" and the second (formerly
"query_parameters") simplified to become "parameters".
Rationale:
• The current QueryFilter is definitively intended to match the DDS query.
ContentFilteredTopic is also a very important DDS feature that should be
accessible through ccm-dds.
• Configuration attributes fin porttype definitions is also useful for many
other uses of the GIS (was missing)