nodogsplash: Backport Version 4.0.1. (#494)

nodogsplash: Backport Version 4.0.1. (#494)

This version has numerous fixes and enhancements.
It is compatible with the previous v3.2.1 release and onwards.

Important fixes in this version:
 * Fix coding error in fas-aes.php [bluewavenet]
 * Make debuglevel platform independent [mwarning]
 * Fix memory handling bug, issue nodogsplash/nodogsplash#341 [mwarning] [stevo01]
 * ndsctl_thread - ignore interupts when returning from epoll [lynxis]
 * auth.c - use correct types to prevent cast and comparement of uint and int [lynxis]
 * openwrt/init.d - prevent start of the daemon if configuration generation fails [lynxis]
 * Generate Error 403 Forbidden, if Gateway Port is accessed directly [bluewavenet]
 * Validate fasremoteip as a valid dotted format IPv4 address [bluewavenet] [mwarning]
 * Prevent client CPD "Too Many Redirects" error. [bluewavenet]

Maintainer: Moritz Warning <moritzwarning@web.de>

Signed-off-by: Rob White <rob@blue-wave.net>