a lot of fixes, improve visualization speed, add c++ code
diff --git a/wally/config.py b/wally/config.py
index add4df5..95ae511 100644
--- a/wally/config.py
+++ b/wally/config.py
@@ -25,7 +25,7 @@
         self.debug_agents = False  # type: bool
 
         # None, disabled, enabled, metadata, ignore_errors
-        self.discovery = None  # type: Optional[str]
+        self.discover = None  # type: Optional[str]
 
         self.logging = None  # type: 'Config'
         self.ceph = None  # type: 'Config'
@@ -33,7 +33,7 @@
         self.fuel = None  # type: 'Config'
         self.test = None  # type: 'Config'
         self.sensors = None  # type: 'Config'
-        self.discovery = None  # type: Set[str]
+        self.discover = None  # type: Set[str]
 
         self._dct.clear()
         self._dct.update(dct)