Added file with rough network locations of original data files.
Added clustering results to notebook.

- Removed redundant imports.
- R cluster script now saves to .png
Added normalised total count option to repeat_pres_abs.py

- Can now output actual kmer count of most abundant kmers,
    normalised by read count.
- cluster_samples.R now takes an output filename.
- auto_hash_and_count.sh now reports total kmer number to log.