beta3 - More modest algorithm for guessing 1n coveage, no default filtering

• no quantile filtering by default, a new parameter -q to set up the filter, the falg --no-qunatile-filtering was removed (set -q 0.99 to set up the previously default filter)
• algorithm for peak identification was failing if AAB was absent but AAAABB was present. This problem should be resolved by now by considering both the diploid and triploid 1n estimates.
• fixed the installation instructions
• minor fixes