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/dns/gethoststxt.c

@@ -37,7 +37,7 @@ static struct HostsTxtInitialStaticMemory {
 } g_hoststxt_init;
 
 static textwindows dontinline char *GetNtHostsTxtPath(char *pathbuf,
-                                                    uint32_t size) {
+                                                      uint32_t size) {
   const char *const kWinHostsPath = "\\drivers\\etc\\hosts";
   uint32_t len = GetSystemDirectoryA(&pathbuf[0], size);
   if (len && len + strlen(kWinHostsPath) + 1 < size) {
@@ -57,7 +57,7 @@ static textwindows dontinline char *GetNtHostsTxtPath(char *pathbuf,
 const struct HostsTxt *GetHostsTxt(void) {
   FILE *f;
   const char *path;
-  char pathbuf[PATH_MAX];
+  char pathbuf[PATH_MAX + 1];
   struct HostsTxtInitialStaticMemory *init;
   init = &g_hoststxt_init;
   if (!g_hoststxt) {