/*!  \page grib_copy grib_copy
\section DESCRIPTION 
 Copies the content of grib files printing values of some keys.

\section USAGE 
 grib_copy 
 [options] grib_file grib_file ... output_grib_file

\section OPTIONS 
-f  \n Force. Force the execution not to fail on error.
 \n \n -r  \n Repack data. Sometimes after setting some keys involving properties
		of the packing algorithm a repacking of data is needed.
		This repacking is performed setting this -r option.
 \n \n -p key[:{s/d/i}],key[:{s/d/i}],... \n 
		Declaration of keys to print.
		For each key a string (key:s), a double (key:d) or an integer (key:i)
		type can be requested. Default type is string.
 \n \n -P key[:{s/d/i}],key[:{s/d/i}],... \n 
		As -p adding the declared keys to the default list.
 \n \n -w key[:{s/d/i}]{=/!=}value,key[:{s/d/i}]=value,... \n 
		Where clause.
		Only grib messages matching the key/value constraints are copied to the
		output_grib_file.
		A valid constraint is of type key=value or key!=value.
		For each key a string (key:s), a double (key:d) or an integer (key:i)
		type can be defined. Default type is string.
 \n \n -B order by directive \n 
		Order by. The output will be ordered according to the order by directive.
		Order by example: "step asc, centre desc" (step ascending and centre descending)
 \n \n -V  \n Version.
 \n \n -W width \n 
		Minimum width of each column in output. Default is 10.
 \n \n -M  \n Multi-field support off. Turn off support for multiple fields in single grib message.
 \n \n -T T | B | M | A \n Message type. T->GTS, B->BUFR, M->METAR (Experimental),A->Any (Experimental).
			The input file is interpreted according to the message type.
 \n \n -g  \n Copy GTS header. 
 \n \n -G  \n GRIBEX compatibility mode.
 \n \n -7  \n Does not fail when the message has wrong length
 \n \n -v  \n Verbose.
 \n \n 
\section grib_copy_examples grib_copy examples
-# To copy only the pressure levels from a file\n
\verbatim
> grib_copy -w levtype=pl ../data/tigge_pf_ecmwf.grib2 out.grib
\endverbatim\n
-# To copy only the fields that are not on pressure levels from a file\n
\verbatim
> grib_copy -w levtype!=pl ../data/tigge_pf_ecmwf.grib2 out.grib
\endverbatim\n
-# To copy only the first three fields from a file\n
\verbatim
> grib_copy -w count=1/2/3 ../data/tigge_pf_ecmwf.grib2 out.grib
\endverbatim\n
-# A grib_file with multi field messages can be converted in single field messages
with a simple grib_copy.\n
\verbatim
> grib_copy multi.grib simple.grib
\endverbatim\n
-# Use the square brackets to insert the value of a key
in the name of the output file.\n
\verbatim
> grib_copy in.grib 'out_[shortName].grib'
\endverbatim\n
*/