Move the ram allocation phase into rzip_fd to be able to get a more accurate measure of percentage done.

Prevent failure when offset is not a multiple of page size.
Add chunk percentage complete to output.
Tweak output at various verbosities.
Update documentation to reflect improved performance of unlimited mode.
Update benchmark results.
More tidying.

main.c

@@ -720,6 +720,11 @@ int main(int argc, char *argv[])
 		control.flags |= FLAG_SHOW_PROGRESS;
 	}
 
+	if (UNLIMITED && STDIN) {
+		print_err("Cannot have -U and stdin, unlimited mode disabled.\n");
+		control.flags &= ~ FLAG_UNLIMITED;
+	}
+
 	if (argc < 1)
 		control.flags |= FLAG_STDIN;