Removed completed TODOs.

Snakefile

@@ -22,21 +22,12 @@ TODO: Contemplate using lambdify for basis
 TODO: Contemplate allowing vector input for ICs
 TODO: Discuss how wavelet details should be plotted
 TODO: Ask whether we are dealing with inviscid Burgers only
-TODO: Ask whether it is helpful to enforce boundary at every SSPRK3 step
-    -> Done (should be not needed as we enforce for RHS)
 TODO: Ask why we limit the initial time step
 TODO: Ask whether cfl number should be absolute value
 TODO: Ask why cells 1 and -2 are adjusted for Dirichlet boundary
-TODO: Ask about introducing subclasses of Burgers -> Done (do)
 
 Urgent:
 TODO: Add Burgers class completely
-TODO: Add 'update_time_step()' to Burgers -> Done
-TODO: Add derivative basis to Basis class -> Done
-TODO: Fix wrong type for number of quadrature nodes -> Done
-TODO: Add 'solve_exactly()' to Burgers -> Done
-TODO: Add 'update_right_hand_side()' to Burgers -> Done
-TODO: Add Dirichlet boundary -> Done
 TODO: Clean up exact solution for Burgers
 TODO: Add subclasses of Burgers
 TODO: Ignore ghost domains by flagging all cells with it for extreme outlier