Initial import of autoconvert-0.3.13, an intelligent Chinese encoding

Initial import of autoconvert-0.3.13, an intelligent Chinese encoding
converter, into the NetBSD packages system.

Provided in PR 16087 by Rui-Xiang Guo (rxg@ms25.url.com.tw).

AutoConvert is an intelligent Chinese Encoding converter.
It uses built-in functions to judge the type of the input file's Chinese
Encoding (such as GB/Big5/HZ), then converts the input file to any
type of Chinese Encoding you want. You can use autoconvert to
automatically convert incoming e-mail messages. It can also optionally
handle the UNI/UTF7/UTF8 encoding.