install_amavis.sh: interrupt installation if a perl module installaition failed.

install_amavis.sh

@@ -3631,7 +3631,17 @@ for _module in $_needed_cpan_modules ; do
    if [[ "$?" -ne 0 ]] ; then
       installation_failed=true
       error "$(cat $tmp_err_msg)"
+
+		echononl "continue anyway [yes/no]: "
+		read OK
+		OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
+		while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
+			echononl "Wrong entry! - repeat [yes/nno]: "
+			read OK
+		done
+		[[ $OK = "yes" ]] || fatal "Abbruch durch User"
    fi
+
 done
 if ! $installation_failed ; then
    echo_ok