add timestamp and ppms setups

setups/timestamp.py

@@ -0,0 +1,9 @@
+description = 'timestamp dummy detector for offline measurements'
+group = 'optional'
+
+devices = {
+    'timestamp': device('nicos_linse.common.lab.Timestamp', description='time, a dummy detector'),
+}
+
+startupcode = 'SetDetectors(timestamp)'
+