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

libc/fmt/strerror_r.greg.c

@@ -25,6 +25,6 @@
  * @param err is error number or zero if unknown
  * @return 0 on success, or error code
  */
-privileged int strerror_r(int err, char *buf, size_t size) {
+int strerror_r(int err, char *buf, size_t size) {
   return strerror_wr(err, GetLastError(), buf, size);
 }