is_cgi function is back and is working

+ in utils added function eval_file_mode(), it returns http errors codes about file

README.md

@@ -2,19 +2,13 @@
 ## work together
 
 #### next commit
-+ in fill_script_path() : scipt_path and script_info are filled, removing leadin dot
-+ in _cgi_pos() : check validity of extension if it's only alpha characters
-+ severall pbm appears
-
-#### TODO hugo
-- pbm : `http://localhost:4040/cgi-bin/cgi.sh`
 
 #### questions
-- does the root always start with leading "." ?
 - how should we handle a wrong url like `http://localhost/cgi-bin/wrong.phpp/good.php` ?
 	- do we serve `./srcs/cgi-bin/good.php` ?
 	- or do we return 404 "not found" ?
-	- for now, execve would crash, but that doesn't produce a 404 error, rather a 500, is it bad ?
+->	- for now, execve would crash, but that doesn't produce a 404 error, rather a 500, is it bad ?
+	- could we use errno after execve to choose an appropriate http error ? subject says : "Checking the value of errno is strictly forbidden after a read or a write operation"
 - if a url has a file with extension, but it's not a cgi extension, is it necessary to look further ?
 	- ex. `http://localhost/file.php/file.py` for `cgi_ext py;` ?
 - the response page is received long after the cgi-script is done, why ?