Make improvements

- Expand redbean UNIX module
- Expand redbean documentation
- Ensure Lua copyright is embedded in binary
- Increase the PATH_MAX limit especially on NT
- Use column major sorting for linenoise completions
- Fix some suboptimalities in redbean's new UNIX API
- Figured out right flags for Multics newline in raw mode

examples/touch.c

@@ -20,7 +20,7 @@
 int main(int argc, char *argv[]) {
   int i;
   for (i = 1; i < argc; ++i) {
-    if (touch(argv[i], 0644) == -1) {
+    if (touch(argv[i], 0666) == -1) {
       fprintf(stderr, "ERROR: %s: %s\n", argv[i], strerror(errno));
       exit(1);
     }