Add compare_double function to maxmind_test_helper.c
Use regen-prototypes.pl on t/maxminddb_test_helper.*
Use new compare_double function to test double value
Fix parsing for prototypes so it doesn't break on static var declarations
Add missing test_database_path declaration back to maxminddb_test_helper.h
Add compare_float to maxminddb_test_helper and use that in data_types_t.c
Add a test for the MMDB_get_entry_data_list function and the data structure it returns