Removed completed TODOs.

DG_Approximation.py

@@ -21,19 +21,17 @@ TODO: Discuss descriptions (matrices, cfl number, right-hand side,
 TODO: Discuss referencing info on SSPRK3
 
 Urgent:
-TODO: Fix indexing issue in wavelet coefficient calculation
-TODO: Enforce mesh with 2^n cells
-TODO: Enforce even number of ghost cells on each side on fine mesh (?)
-TODO: Change heaviside random to uniform(-100, 100)
+TODO: Change Heaviside random to uniform(-100, 100)
 TODO: Adjust Heaviside to have non-symmetric values (left- and right_value)
-TODO: Rename 'adjustment' to 'shift'
-TODO: Induce shift in IC class
 TODO: Give option to set discontinuity to cell boundary
 TODO: Fix typo in LinearAbsolute
 TODO: Introduce middle_factor for two-sided Heaviside
+TODO: Rename 'adjustment' to 'shift'
+TODO: Induce shift in IC class
 TODO: Move plot_approximation_results() into plotting script
 TODO: Improve file naming (e.g. use '.' instead of '__')
 TODO: Check whether ghost cells are handled/set correctly
+TODO: Enforce even number of ghost cells on each side on fine mesh (?)
 TODO: Unify use of 'length' and 'len' in naming
 TODO: Unify use of 'initial_condition' and 'init_cond' in naming
 TODO: Unify use of 'mesh' and 'grid' in naming