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/parsehttpmessage.c

@@ -36,7 +36,7 @@
  */
 void InitHttpMessage(struct HttpMessage *r, int type) {
   assert(type == kHttpRequest || type == kHttpResponse);
-  memset(r, 0, sizeof(*r));
+  bzero(r, sizeof(*r));
   r->type = type;
 }