HLT component to write data to files. The directory where to write the files

HLT component to write data to files. The directory where to write the files
has to be specified as component argumet with the -directory <directory> option.
At least one data type has to be specified as component argumet with the
-datatype <datatype>. Any number of valid datatype can be specified.
Example of usage.

-componentargs "-directory /home/perthi/HLT/phos/data/  -datatype gkCellEnergyDataType  -datatype gkDDLPackedRawDataType"

The command abowe will write both celle energies and untouched raw RCU data to separate files in the
directory /home/perthi/HLT/phos/data/. Currently one file will be written per event.