Cleaned up Pedestal (#370)

- renamed pedestal.hpp to bind_Pedestal.hpp for python bindings
- variance is now always calculated in double and made private
- cost correctness in a few places
- removed push_fast and explicit updates of mean from Pedestal. If
performance is needed use FastPedestal
- Pedestal no longer caches std

python/src/module.cpp

@@ -16,6 +16,7 @@
 #include "bind_FastPedestal.hpp"
 #include "bind_Interpolator.hpp"
 #include "bind_MultiThreadedFileReader.hpp"
+#include "bind_Pedestal.hpp"
 #include "bind_PedestalTrackingPixelHistogram.hpp"
 #include "bind_PixelHistogram.hpp"
 #include "bind_PixelMap.hpp"
@@ -27,7 +28,6 @@
 #include "file.hpp"
 #include "fit.hpp"
 #include "jungfrau_data_file.hpp"
-#include "pedestal.hpp"
 #include "raw_master_file.hpp"
 #include "raw_sub_file.hpp"
 #include "var_cluster.hpp"