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/runtime/memtrack.internal.h

@@ -46,6 +46,7 @@ struct MemoryIntervals {
   size_t i, n;
   struct MemoryInterval *p;
   struct MemoryInterval s[OPEN_MAX];
+  _Alignas(64) char lock;
 };
 
 extern hidden struct MemoryIntervals _mmi;