added _encoding_mysql2iana(),_encoding_iana2mysql();added support for encoding option;added dbd_conn_quote_string()
added _encoding_mysql2iana(),_encoding_iana2mysql();added support for encoding option;added dbd_conn_quote_string()

cention-nazri/libdbi-drivers,cention-nazri/libdbi-drivers,cention-nazri/libdbi-drivers,cention-nazri/libdbi-drivers