update colormapr
* mulitmap
* refactored calc_minmax slightly, renamed to bin_data; bin_data->spread_bins
multimaps, decoding in js. Doesn't work above multimaps>100x100, prepare in python. Stash this version.
Precalculate multimaps.
labels voor multimap meenemen in js.
percentile maps
separate multimap-js-code.