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/foldheader.c

@@ -21,6 +21,9 @@
 #include "libc/str/str.h"
 #include "net/http/http.h"
 
+/**
+ * Collapses repeating headers onto a single line.
+ */
 char *FoldHeader(struct HttpMessage *msg, char *b, int h, size_t *z) {
   char *p;
   size_t i, n, m;