Handle '+' in querystring

Translate '+' to ' ' in querystring parser (still doesn't handle %xx)

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

parsing.c

@@ -92,6 +92,8 @@ int cgit_parse_query(char *txt, configfn fn)
 		if (c=='=') {
 			*t = '\0';
 			value = t+1;
+		} else if (c=='+') {
+			*t = ' ';
 		} else if (c=='&') {
 			*t = '\0';
 			(*fn)(txt, value);