nicer algorithm, permalink support

package.json

requirements/base.txt

...g_calc/templates/rv_voting_calc/includes/option_list.html

rv_voting_calc/templates/rv_voting_calc/index.html

...g_calc/templates/rv_voting_calc/steps/removed_option.html

rv_voting_calc/views.py

rybicka/settings/base.py

static_src/rv_voting_calc.js