add to 0.7.2 changelog

CHANGELOG

@@ -14,7 +14,45 @@ For a complete change history, see the SVN log.
 Mapnik 0.7.2 Release
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-- Added forward compatibility to Mapnik 2.0 (https://trac.mapnik.org/wiki/Mapnik2/Changes)
+- Added forward compatibility for Mapnik 2.0 XML syntax (https://trac.mapnik.org/wiki/Mapnik2/Changes)
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+- Build fixes to ensure boost_threads are not used unless THREADING=multi build option is used
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+- Fixes for the clang compiler
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+- Support for latest libpng (>= 1.5.x) (r2999)
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+- Fixes to the postgres pool
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+- Fix for correct transparency levels in png256/png8 output (#540)
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+- Various build system fixes, especially for gcc compiler on open solaris.
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+- When plugins are not found, report the searched directories (#568)
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+- Improved font loading support (#559)
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+- Fix to shapeindex for allowing indexing of directory of shapefiles like `shapeindex dir/*shp`
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+- Fixed handling of null and multipatch shapes in shapefile driver - avoiding inf loop (#573)
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+- Fixed raster alpha blending (#589,#674)
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+- Enhanced support for faster reprojection if proj >= 4.8 is used (#575)
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+- Allow for late-binding of datasources (#622)
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+- Fix to OSM plugin to avoid over-caching of data (#542)
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+- Various fixes to sqlite, ogr, and occi driver backported from trunk.
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+- Ensured that '\n' triggers linebreaks in text rendering (#584)
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+- Support for boost filesystem v3
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+- Fixes to cairo renderer to avoid missing images (r2526)
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+- Fixed reading of label_position_tolerance on text_symbolizer and height for building_symbolizer
 
 
 Mapnik 0.7.1 Release