Removed completed TODOs.

DG_Approximation.py

@@ -9,12 +9,12 @@ TODO: Contemplate separating cell average and reconstruction calculations
 TODO: Contemplate removing Methods section from class docstring
 
 Urgent:
-TODO: Enforce abstract classes/methods (abc.ABC, abc.abstractmethod)
 TODO: Introduce Mesh class
     (mesh, cell_len, num_grid_cells, bounds, num_ghost_cells, etc.)
 TODO: Check whether ghost cells are handled/set correctly
-TODO: Find error in centering for ANN training
+TODO: Replace getter with property attributes for quadrature
 TODO: Remove use of DGScheme from ANN_Data_Generator
+TODO: Find error in centering for ANN training
 TODO: Adapt TCD from Soraya
     (Dropbox->...->TEST_troubled-cell-detector->Troubled_Cell_Detector)
 TODO: Add verbose output
@@ -25,6 +25,7 @@ TODO: Add an environment file for Snakemake
 Critical, but not urgent:
 TODO: Check sign change in stiffness matrix to accommodate negative wave speed
 TODO: Investigate g-mesh(?)
+TODO: Create g-mesh with Mesh class
 TODO: Force input_size for each ANN model to be stencil length
 TODO: Use full path for ANN model state
 TODO: Extract object initialization from DGScheme