update htrsim to devtools package

src/htrsim_beta/input_estimation.R

src/htrsim_beta/launch_deseq.R

src/htrsim_beta/main.R

src/htrsim_beta/setup_cntsGenerator.R

src/htrsim_beta/setup_deseq.R

src/tuto_beta/tutorial_htrsim.R

src/tuto_beta/tutorial_htrsim.Rmd