More deprecations in lib6, and updates to lib7

test/unit7/stdlib/io/bytebuffer.c3

@@ -4,7 +4,7 @@ import std::io;
 fn void write_read()
 {
 	ByteBuffer buffer;
-	buffer.new_init(0);
+	buffer.init(mem, 0);
 	defer buffer.free();
 	buffer.write("hello")!!;