amp_hist creates a histogram to visualise distribution of average
amplification rates.
amp_hist()It will write to jpg file a histogram average amplification rates.
When run it uses the "sample_error_results.csv", an output
from running gen_errors, to produce a histogram to aid in
visualising the distribution of amplification.
The plot is printed to screen and also saved as a jpg file to the `results/threshold/` sub-directory. It can be used to determine an amplification threshold for further data cleaning.
if (FALSE) {
amp_hist()
}