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/calls/geteuid.c

@@ -22,10 +22,15 @@
 
 /**
  * Returns effective user ID of calling process.
+ * @return user id
  */
 uint32_t geteuid(void) {
   int rc;
-  rc = sys_geteuid();
+  if (!IsWindows()) {
+    rc = sys_geteuid();
+  } else {
+    rc = getuid();
+  }
   STRACE("%s() → %d% m", "geteuid", rc);
   return rc;
 }