CDO

New operators:

• fldcor: correlation in grid space
• timcor: correlation over time
• gridbox<stat>: computes statistical values over surrounding grid boxes

Changed operators:

• import_binary: added support for variables with different number of levels
• random: added optional parameter 'seed'

Fixed bugs:

• standard deviation: changed the result from missval to zero, if variance is zero
• fldsum: change result from 0 to missval, if only missing values found
• intyear: set the interpolation result always to missval, if missing values found
• Added support for netCDF time bounds
• sellonlatbox: parameter lon2 was not inclusiv
• expr: added support for calculations of const/var
• setday: writes sometimes wrong date information with GRIB result from afterburner
• inputsrv: added level information
• merge: added support to merge levels with datasets in netCDF format