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

net/http/underlong.c

@@ -46,7 +46,7 @@ char *Underlong(const char *p, size_t n, size_t *z) {
   if (n == -1) n = p ? strlen(p) : 0;
   if ((q = r = malloc(n + 1))) {
     for (i = 0; i < n;) {
-      memset(vz, 0, 16); /* 50x speedup for ASCII */
+      bzero(vz, 16); /* 50x speedup for ASCII */
       while (i + 16 < n) {
         memcpy(v1, p + i, 16);
         pcmpgtb(v2, v1, vz);