utility function doWithZipFile to be integrated in main script

Signed-off-by: Pau Arumi <pau.arumi@parumi.org>
extracted printHeader (CSV)

Signed-off-by: Pau Arumi <pau.arumi@parumi.org>
now looks dac files in a dir

Signed-off-by: Pau Arumi <pau.arumi@parumi.org>