Errobars: Update, loads faster.

beaker-notebooks/errorbars_html.bkr

example-data/errorbars/error_bar_convergence_VASP_170223.db

example-data/errorbars/error_bar_monomers.json

example-data/errorbars/errorbar_base.py

example-data/errorbars/errorbar_reference.json

example-data/errorbars/recommended_POTCAR.dat