ERT-781 Added c vector to hold key words
ERT-781 Added method to dump key to csv file
ERT-781 Added method to ecl sum to use the new csv dump functionality
ERT-781 Added class to use key word vector in c
ERT-781 Added the new csv export functinality to ecl sum in Python
ERT-781 Addded test to write out a small sample using the new csv export