Support for various app and slic wrapper

ext/counteradjustable.py

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+from slic.core.adjustable import Adjustable
+
+class CounterAdjustable(Adjustable):
+    def __init__(self, adjustable1, adjustable2):
+        self.adj1=adjustable1
+        self.adj2=adjustable2
+        self.ref_values()     # implementation needs reference values to convert absolute scan to relative scan
+
+    def ref_value(self):
+        self.val1 = self.adj1.get_current_value(readback = False)
+        self.val2 = self.adj2.get_current_value(readback = False)
+
+    def set_target_value(self, value):
+         t1 = self.adj1.set_target_value(self.val1 + value)
+         t2 = self.adj2.set_target_value(self.val2 - value)
+         t1.wait()
+         t2.wait()
+
+    def get_current_value(self):
+         return self.adj1.get_current_value()
+
+    def is_moving(self):
+        return any([self.adj1.is_moving(),self.adj2.is_moving()])