move to a more standard python packaging structure

src/damaris/data/Persistance.py

@@ -0,0 +1,28 @@
+class Persistance :
+    def __init__(self, shots):
+        self.shots = shots
+        self.accu = 0
+        self.counter = 0
+        self.result_list = []
+
+    def fade(self, res):
+        self.counter += 1
+        if self.accu == 0:
+            self.accu=res+0
+        self.result_list.append(res)
+        if self.counter < 1:
+            for i,ch in enumerate(self.accu.y):
+                ch += res.y[i]
+        elif len(self.result_list) == self.shots:
+            self.counter = len(self.result_list)
+            old_result = self.result_list.pop(0)
+            for i,ch in enumerate(self.accu.y):
+                ch *= self.shots
+                ch -= old_result.y[i]
+                ch += res.y[i]
+        else:
+            for i,ch in enumerate(self.accu.y):
+                ch *= self.counter-1
+                ch += res.y[i]
+        self.accu /= self.counter
+        return self.accu