start refactor for data backend by only improting datalad into one submodule

corrlib/data_backend/databackend.py

@@ -0,0 +1,7 @@
+import .datalad as dl
+
+
+class DataBackend:
+    @abstractmethod
+    def get_file(self, data, file):
+        pass

corrlib/data_backend/datalad.py

@@ -0,0 +1,13 @@
+import datalad.api as dl
+import os
+from corrlib.data_backend.databackend import 
+
+def DLBackend()
+
+def get_file(path, file):
+    if file == "backlogger.db":
+        print("Downloading database...")
+    else:
+        print("Downloading data...")
+    dl.get(os.path.join(path, file), dataset=path)
+    print("> downloaded file")

corrlib/tools.py

@@ -17,13 +17,4 @@ def m2k(m):
 
 def k2m(k):
     return (1/(2*k))-4
-
-
-def get_file(path, file):
-    if file == "backlogger.db":
-        print("Downloading database...")
-    else:
-        print("Downloading data...")
-    dl.get(os.path.join(path, file), dataset=path)
-    print("> downloaded file")