Use pointer to stream instead of reference to stream to allow for null streams
Added write_sampler_state for general implementation display
Don't clear vectors before appending param names and values
Added sample output method
Intermediate reworking of command to use mcmc_writer
Print diagnostic information
updating test to use a test fixture
added test for update_q in expl_leapfrog test
updating expl_leapfrog test with an end_update_p test
adding evolve tests for expl_leapfrog
Add internal stream for generic output
adding test for stepsize_adaptation
updating tests
adding a few more value tests for stepsize_adaptation
rstan, print progress as Stan but use \r
updating expl_leapfrog test
adding another test for integrator using diag_e_metric. disabled for now
adding diag element to test
updated to-do lists and minor doc changes
fixed file name of model in R code to call it