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

tool/decode/lib/bitabuilder.c

@@ -58,7 +58,7 @@ bool bitabuilder_setbit(struct BitaBuilder *bb, size_t bit) {
   if (i > bb->n) {
     n = i + (i >> 2);
     if ((p2 = realloc(bb->p, n))) {
-      memset((char *)p2 + bb->n, 0, n - bb->n);
+      bzero((char *)p2 + bb->n, n - bb->n);
       bb->n = n;
       bb->p = p2;
     } else {

tool/decode/lib/disassemblehex.c

@@ -44,7 +44,7 @@ void disassemblehex(uint8_t *data, size_t size, FILE *f) {
         if (i == size) break;
       }
       fprintf(f, "\t.%s\t", "byte");
-      memset(glyphs, 0, sizeof(glyphs));
+      bzero(glyphs, sizeof(glyphs));
     }
     /* TODO(jart): Fix Emacs */
     glyphs[col] = kCp437[ch == '"' || ch == '\\' || ch == '#' ? '.' : ch];