Protein vs rna motif plot

[DimmestP]

Fix #110 Adds a new Sup Fig 1 with mean construct protein/RNA levels instead of biorep vs biorep

[ewallace]

I 90% like it. Remaining issues:

• the relative mRNA abundance for reference construct is not centred at 1. Is that a geometric mean/arithmetic mean thing, median thing, or what? which relates to:
• should we have this on the log2-scale as our other comparable plots (e.g. Fig 1C) are on log2 scale?
• the figure legend/caption should remind the normalisation procedure, avergaing, number of replicates, etc.
• the purple-grey colour for mod_ANNNN is visually indistinguishable from the grey for WT in tPIR1 plot, is there a way to pick those out?