[ADD] py.js: len() and truthiness on lists, tuples and dicts

* use new support to colorize reconciled bank statement lines
* fixes tokenization of ``is not`` to not blow up on ``not foo``
* improves calling code to get truthiness of evaluated expression
  instead of truthiness of javascript-equivalent objects: an empty list
  is falsy in Python but truthy in javascript, since the evaluated
  expression is in Python one would expect Python truthiness rules
  without having to manually convert to boolean

closes #5070

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