Docu update

ChangeLog

-2012-07-??  Uwe Schulzweida  <Uwe.Schulzweida@zmaw.de>
+2012-07-23  Uwe Schulzweida  <Uwe.Schulzweida@zmaw.de>
 
 	* Version 1.5.6 released
 	* using CGRIBEX library version 1.5.3
 
 2012-07-17  Modali Kameswarrao  <modali.kameswarrao@zmaw.de>
 
-	* added vlistDefVarEnsemble() for GRIB and netCDF
+	* added vlistDefVarEnsemble() for GRIB1 and netCDF
 
 2012-07-13  Uwe Schulzweida  <Uwe.Schulzweida@zmaw.de>
 

NEWS

 CDI NEWS
 --------
 
-Version 1.5.6 (?? ??? 2012):
+Version 1.5.6 (27 July 2012):
 
    New features:
+     * netCDF: added support for environment variable NC_CHUNKSIZEHINT
+     * GRIB2: added support for level type HYBRID_HALF
+     * GRIB2: added support for grib_api key stepType with TSTEP_<type> in vlistDefVar()
    Fixed bugs:
      * wrong netCDF output for unscaled uint8, int8, int16, int32 variables (bug introduced in 1.5.5)