Removed max field from KVDatum
Added io_put_int* and io_get_int* functions
Added memory output
Added features support
Added gdbm KVDB implementation
Changed handling of default values with add_flag
Slight change to KVOpener and implemented GDBM opener
API changes to flags sublib
Improved an error message
Added flags_errorf
Don't handle GDBM_FILE_OPEN_ERROR when creating a new database
Parse "y" and "n" as boolean flags