Address reviews

- Replacing `BaseData.AdjustResolution` for `DefaultResolution` and
`SupportedResolutions`
- Making `Resolution` nullable for `Algorithm.AddData` methods
- The `ISubscriptionDataConfigService` will set the default resolution
if none was provided and assert it is supported
- Fix bug with `PythonData` `IsSparseData` and `RequiresMapping`
resolution

Algorithm.Python/CustomDataUsingMapFileRegressionAlgorithm.py

@@ -44,11 +44,11 @@ class CustomDataUsingMapFileRegressionAlgorithm(QCAlgorithm):
         self.initialMapping = False
         self.executionMapping = False
         self.foxa = Symbol.Create("FOXA", SecurityType.Equity, Market.USA)
-        self.symbol = self.AddData(CustomDataUsingMapping, self.foxa, Resolution.Tick).Symbol
+        self.symbol = self.AddData(CustomDataUsingMapping, self.foxa).Symbol
 
         for config in self.SubscriptionManager.SubscriptionDataConfigService.GetSubscriptionDataConfigs(self.symbol):
             if config.Resolution != Resolution.Minute:
-                raise ValueError("Expected resolution to be adjust to Minute")
+                raise ValueError("Expected resolution to be set to Minute")
 
     def OnData(self, slice):
         date = self.Time.date()
@@ -92,6 +92,14 @@ class CustomDataUsingMapping(PythonData):
         '''True indicates mapping should be done'''
         return True
 
-    def AdjustResolution(self, resolution):
-        '''Adjust resolution'''
-        return Resolution.Minute
+    def IsSparseData(self):
+        '''Indicates that the data set is expected to be sparse'''
+        return True
+
+    def DefaultResolution(self):
+        '''Gets the default resolution for this data and security type'''
+        return Resolution.Minute
+
+    def SupportedResolutions(self):
+        '''Gets the supported resolution for this data and security type'''
+        return [ Resolution.Minute ]