added create_tarball.sh script for packing distribution

Signed-off-by: Ignacio Pisso <Ignacio.Pisso@nilu.no>

create_tarball.sh

+#!/bin/bash
+
+
+tarball_tmp=flexpart$1 
+
+mkdir $tarball_tmp
+mkdir $tarball_tmp/src
+cp src/*.f90 $tarball_tmp/src
+cp src/makefile $tarball_tmp/src
+cp src/makefile.gfs $tarball_tmp/src
+cp -r options $tarball_tmp
+
+tar -cvf flexpart$1.tar $tarball_tmp/*
+