kills the simple wave propagation

add mda_n_low, mda_n_high parameters that allow to control the truncation interval for the MDA heuristic

* convert error to warning when unknown parameters are found

* add tests

* allow to selectively insert for loop macros

* add inbounds,simd,debug to @with_signature options

* add ref test

* add HeatEq project

* add helpers to run test parfiles with main()

split conservative fixing from cons2prim; fixup cons2prim so that symmetric shock tubes are actually symmetric

fixup cons2prim

Migrate all of EulerEq project to use new boradcasting methods

See merge request !59

* remove t=0.6 output step from euler_sod_shock_tube_entropyav reftest

* rename euler_sod_shock_tube test to euler_sod_shock_tube_bernstein
also set `every_dt = 0` for ref test parfile

* migrate rest of Euler 1d + AV to use new broadcasting

* fixup new_broadcast_bdry and test it with 1d + AV method

* ref test euler_sod_shock_tube_entropyav: crank up CFL

* enable output checking for euler_sod_shock_tube test

* add ref test euler_sod_shock_tube_entropyav

* migrate 1d + AV method

* fixup migration of 1d eqs

* strip new_ from new 2d equations

* implement interpolate_face_data! for 1d mesh; migrate llf for 1d mesh

* migrate 1d equations to use new broadcasting, pt 1

* clean up more equations

* convert entropy variables computation and maxspeed
to use new broadcast interface

needed to update 2d ref tests, because somehow changing
speed computation showed massive differences in ref output

* use new broadcasts for other 2d rhs

* ref test: use aligned_ts for euler2d isentropic

* use new broadcast for 2d + AV method

* add klevin helmholtz as ref test

use aligned_ts for output times