Smooth contact heatmap in simple model

[mikessh]

• We can use bootstrap
• We can set distances for residues that fall out of CDR sequence (e.g. -7 for 10AA CDR3) to the distance of Cys residue (or just some constant value, e.g. 25angstrom)

see https://github.com/antigenomics/tcr-pmhc-study/blob/master/model/model_simple.Rmd#calpha-distance-model