Added insertion odds, length indicators
Added insertion odds, length indicators

This adds a little square for columns that have high odds of an
insertion at that point. It also adds another square if the length of
the insertion will be large.

Tested this with ~13.5K columns and it runs in about 4 seconds on my
laptop.

Janelia-Farm-Xfam/hmm_logo_js,Janelia-Farm-Xfam/hmm_logo_js