[MISC] Display layout

[eseiler]

• Confirm difference between k-mer and minimiser view with current display_layout
• Add R scripts

Need to reconfirm:

I noticed that it makes a difference whether prepared files (uses canonical k-mers) are used or the original sequence files (uses single-strand k-mers).

For RefSeq:

                Sum size        Sum shared
Sequence files  33,144,873,270  9,978,878
Minimizer files 30,633,516,270  29,443,347

[eseiler]

After rerun (files in #192):

	Sum Estimated Size	Sum Actual Shared k-mers	Percent Shared
Sequence Files	33,144,869,031	9,564,640	0.029
Minimiser Files	30,751,967,528	37,070,817	0.121

[eseiler]

Using minimisers seems to result in better layouts, see new plots in #195

	Sum Estimated Size	Sum Actual Shared k-mers	Percent Shared
Sequence Files	33,144,869,031	9,564,641	0.029
Minimiser Files	28,332,169,000	47,688,807	0.168

For minimiser files, two bins stand out:

tb_index size      shared_size   ub_count kind   splits
46       3,848,605 3,734,818     192      merged 1
47       3,854,088 3,658,388     192      merged 1