Added byte type

lib/io/io.q

@@ -6,22 +6,22 @@ const std {
 	err 2
 }
 
-in(buffer []int8) -> int {
+in(buffer []byte) -> int {
 	return sys.read(std.in, buffer, len(buffer))
 }
 
-out(buffer []int8) -> int {
+out(buffer []byte) -> int {
 	return sys.write(std.out, buffer, len(buffer))
 }
 
-error(buffer []int8) -> int {
+error(buffer []byte) -> int {
 	return sys.write(std.err, buffer, len(buffer))
 }
 
-read(fd int, buffer []int8) -> int {
+read(fd int, buffer []byte) -> int {
 	return sys.read(fd, buffer, len(buffer))
 }
 
-write(fd int, buffer []int8) -> int {
+write(fd int, buffer []byte) -> int {
 	return sys.write(fd, buffer, len(buffer))
 }