Squash into a single commit

Author: TimBerberich

docs/utilities.md

@@ -29,3 +29,27 @@ else.
 ## Fitting functions
 
 ::: extra.utils.fit_gaussian
+
+## Incremental variance
+
+::: extra.utils.xcca._CumulativeVarianceBase
+
+::: extra.utils.xcca.CumulativeVariance
+	options:
+      inherited_members: false
+
+::: extra.utils.xcca.CumulativeVarianceMasked
+	options:
+      inherited_members: false
+
+## Angular cross-correlation (XCCA)
+
+::: extra.utils.xcca.AngularCorrelator
+
+::: extra.utils.xcca.AveragedAngularCorrelation
+	options:
+      inherited_members: false
+
+::: extra.utils.xcca.AveragedAngularCorrelationMasked
+	options:
+      inherited_members: false

src/extra/applications/base.py

@@ -62,22 +62,23 @@ def _asdict(self):
         Return serializable dict.
         """
         pass
-
-    def _fromdict(self, all_data):
+    
+    @classmethod
+    def _fromdict(cls, all_data):
         """
         Rebuild it from dict.
         """
-        pass
+        return cls(**all_data)
 
     @classmethod
     def from_file(cls, filename: str):
         """
         Load setup saved with save previously.
         """
-        obj = cls()
+        #obj = cls()
         with h5py.File(filename, "r") as fid:
             all_data = load_dict(fid)
-            obj._fromdict(all_data)
+            obj = cls._fromdict(all_data)
 
         return obj