* Moved hardcoded `DEFAULT_MAP`, `DEFAULT_MAP_X`, and `DEFAULT_MAP_Y` definition to conf/char_athena.conf: `default_map`, `default_map_x`, and `default_map_y` for `DEFAULT_MAP`
* Default map existance check only will be checked once, after map_index finished load by char-server, previously map-server also do a check that maybe cause unnecessary debug message
* `instance_start` value should be init'd with `map_num` not by `map_num + 1`. I was causing send extra 1 empty map to char-server.
* A little clean up in `chmapif_parse_getmapname()` and `doc/packet_interserv.txt`
Signed-off-by: Cydh Ramdh <house.bad@gmail.com>