apply a "regularization" technique to properly transform MNA representation (a "DAE") to ODE form.  Just RLC tank for now
remove RLC tank circuit PRIMA example.  It is actually too small to have a useful reduction this way
apply input regularization to coupling example as well
Change the regularization approach slightly so we use the custom permutation code
I added to the coupling test case for RLC as well.  LU factorization wasn't as easy
to use as I had imagined for this purpose... and probably would be slower, too.