added timeout response (status 408)

+ added EPOLLERR and EPOLLHUP handling
+ fix root substitution for default "/" location (temp or permanent ?)
+ tested siege a little, seems good

memo.txt

@@ -1,5 +1,4 @@
 IN 42 SUBJECT AND/OR PRIORITY :
-- Fix "href" in autoindex
 - CGI
 - chunked request (response not mandatory it seems)
 - Ecrire des tests !
@@ -9,7 +8,6 @@ IN 42 SUBJECT AND/OR PRIORITY :
 - replace atoi() with a better function to avoid overflow
 	like strtol : https://www32.cplusplus.com/reference/cstdlib/strtol/
 -----------------------------
-- 408 Request Timeout
 - gerer le champ "Accept" du client
 - gerer les ".." dans un URL (verifier que l'on ne sort pas du dossier "root")
 - do correct handling of special character in url (/rfc2119_files/errata.js.t%C3%A9l%C3%A9chargement -> /rfc2119_files/errata.js.téléchargement)