Shorten the long ass `unsigned long long int' to ulli.

src/list.h

@@ -2,13 +2,15 @@
 #include <gmp.h>
 #include <stdbool.h>
 
+#include "types.h"
+
 /**
  * @brief An infinitely expanding list type.
  */
 typedef struct {
 	mpz_t *list; //!< The list of elements
-	unsigned long long int size; //!< How many elements are in the list
-	unsigned long long int end; //!< The last element of the list (in use)
+	ulli size; //!< How many elements are in the list
+	ulli end; //!< The last element of the list (in use)
 } List;
 
 /**