Move CSV code into its own file

csv.hpp

@@ -0,0 +1,14 @@
+#ifndef CSV_HPP
+#define CSV_HPP
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <vector>
+#include <string>
+#include <map>
+
+std::vector<std::string> csv_split(char *s);
+std::string csv_dequote(std::string s);
+void readcsv(char *fn, std::vector<std::string> &header, std::map<std::string, std::vector<std::string>> &mapping);
+
+#endif