Changes 5.6.5:
* Fixed scale calculation problem caused by mapscale.c's inchesPerUnits
  array being out of synch with MS_UNITS enum
* Fixed bitmap text font rendering (tiny was not working)

Changes 5.6.4:
IMPORTANT SECURITY FIXES:
* Disabled some insecure (and potentially exploitable) mapserv command-line
  debug arguments.
* Fixed possible buffer overflow in msTmpFile()

Other fixes:
* Fixed possible race condition with connectiontype WFS layers
* Modified mapserver units enum order to fix some problems with external
  packages
* fix blending of transparent layers with AGG on MSB archs
* Fixed imageObj->saveImage() sends unnecessary headers
* Correct PropertyName parsing for wfs post requests
* Ensure mapwmslayer.c does not unlink file before closing connection on it
* Fix security exception issue in C# with MSVC2010
* Write out join CONNECTIONTYPE when saving a mapfile.
* Fixed attribute queries to use an extent stored (and cached) as part of
  the queryObj rather than the map->extent.
* Reverted msLayerWhichItems() to 5.4-like behavior although still supporting
  retrieving all items
* Grid layer: remove drawing of unnecessary gird lines
* OGC Filters for spatial dbs should be enclosed in parentheses
* Improve the handling of simple string comparisons for raster classified
  values
* Add the ogc namspace to filters generated by Mapserver
* Fix MS_NONSQUARE to work in mode=map
* Improve error message when loadQuery() filename extension check fails
* Fix GetLegendGraphic using keyimages
* Fix getFeatureInfo queries on WFS layers
* Fixed mapstring.c build problem related to errno
* Correct ungeoreferenced defaults via GetExtent() on raster layer
* More adjustments to how TLOCK_GDAL held around msGetGDALGeoTransform


(adam)