Improve fetchmail support (#289)

Fetchmail is now configured by a script called 'setup-fetchmail'.
The script 'debug-fetchmail' is used inside the 'setup.sh' script.

target/bin/debug-fetchmail

@@ -0,0 +1,10 @@
+#! /bin/sh
+
+/usr/local/bin/setup-fetchmail
+
+su -s /bin/sh -c "/usr/bin/fetchmail \
+	--verbose \
+	--daemon 0 \
+	--nosyslog \
+	--nodetach \
+	-f /etc/fetchmailrc" fetchmail <&- 2>&1