update to 0.92.2

many changes / fixes (see NEWS for details)
including:

* Autorouting of orthconn lines.  Still fairly primitive, doesn't avoid
  objects, but at least goes the right way out of connectionpoints (when
  connectionpoints have their dirs set).
* Parenting.  Objects can now be set to be parents of others (so far, only
  the UML Large Package is set so by default).  Objects created into these
  or explicitly added are moved with the parent and cannot be moved
  outside.
* Dynamic grid that changes with zoom scale.
* Grid now has thicker line every n lines (default 5).  Stippled grid
  option removed.
* Mouse wheel(s) can be used to scroll and zoom.
* More diagram properties can be set for existing diagrams, and are loaded
  and saved.
* UML Component features:  Event sources and sinks.
* Improved undo of grouping and ungrouping.
* Updates of the Python plugin:
  - groups, rgb, and images can be manipulated
  - better svg parsing
* Gnome and Gnome HIG conformance better.
* Better text alignment in flowchart objects.
* Better SVG export.
* Better arrow head calculations.
* More tooltips.

This also fixes a gcc3 build problem.

ok'ed by wiz@

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