v6.4.6

• enable json format for dballe, fix bug disabling formats other than BUFR
• consider timerange 200 as timerange 0 for statistical processing
• handle ECMWF 3 hour min/max temperatures (#84)
• Updated vargrib2bufr, fixed compiler errors for F32
• Exclude dba_qcfilter command from package
• CentOS 8 build: re-enabling gdal and ncl dependencies
• fixed texlive dependencies
• fixed but in metamorphosis:mask
• improve and extend handling of level numeric conversion in import/export and vertint
• fixed bug on statistical processing (#75)
• adapted specfile for centos 8 builds
• new tools vg6d_getpoint_pkauf and vg6d_tcorr
• move specific tools in libexec
• improvement of tesat, implementation of termolib tests
• add functions for air density and virtual temperature
• add lwc method for computing visibility
• refactoring of log4c interface, remove dependency on cnf
• removed support for oracle@sim
• fixed issue in eccodes support (see #52)