Features: 4th-order accurate Burgers solver & animator#27
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This commit 1. Adds scalar_1D_t operators to support 4th-order Runge-Kutta (RK4) time advancement for the Burgers equation solver, 2. Defaults the Burgers solver to RK4, 3. Saves the solver output to example/scripts/burgers-order-4.dat, and 4. Adds example/scripts/animate-burgers.gnuplot, which uses gnuplot to create an animated GIF of the analytical & numerical solutions.
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This PR
scalar_1D_toperators to support 4th-order Runge-Kutta (RK4) time advancement for the Burgers equation solver,example/scripts/burgers-order-4.dat, andexample/scripts/animate-burgers.gnuplotscript creates Burgers solver solution animations.