hitrun.c done editing

probably broken, not even tried to compile
also finished editing hitrun.R

It's probably broken too
Woot!  Now syntactically correct

We pass

    R CMD check --no-vignettes --no-examples polyapost
Woot!  Now pass R CMD check

But there are no tests in the tests directory
and the example for hitrun has zero MCSE,
which has to be bogus.
moved tests/hitrun.R from mcmc package

but it hasn't been modified for this package yet