Log Message:
Changes 5.6.3:
- Fixed XML transformation issues with expressions and symbols
- Fixed problem with PostGIS SQL bbox introduced in 5.6.2
- Fix backwards handling of iconv errors (w/ SDE) introduced in 5.6.2

Changes 5.6.2:
- Check error returns from mapstring functions
- Correct mutex locking problem with rasters with no inherent georef.
- Fixed problem with isValidItem vs OGR special attributes
- Support wrap character for SVG output
- Fixed msMSSQL2008CloseConnection() to free the statement handle properly
- Fixed PHP MapScript's metadata.nextkey() that was sometimes skipping some
  entries on first call because the NULL arg was not properly handled
- Fixed the query handling with the MSSQL2008 driver
- Fixed swig zoomRectangle() method: the maxy in the rect object have to
  be < miny value
- Backport fix for SLD filters column names detection
- Backport fix for WFS OGC filters regex tests