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/log/checkfail_ndebug.c

@@ -36,7 +36,7 @@
 relegated void ___check_fail_ndebug(uint64_t want, uint64_t got,
                                     const char *opchar) {
   __restore_tty();
-  kprintf("%n%serror: %s: check failed: 0x%x %s 0x%x (%s)%n",
+  kprintf("\n%serror: %s: check failed: 0x%x %s 0x%x (%s)\n",
           !__nocolor ? "\e[J" : "", program_invocation_name, want, opchar, got,
           strerror(errno));
   __restorewintty();