Now stores all supplied answers to multi-answer question as arrayref
Variable [[var]] text replacement converts to comma-separated list
Expression Engine's value() returns appropriate value depending on context
Expression Engine's score() does sum of multi-answers, as you would expect
Updated related i18n & hover-help, and tests
Cleaned up survey js somewhat
it in the response data structure along with the actual user input. Tag data
can be used in subsequent expressions, in [[tag]] templated text replacement,
and to classify responses in an arbitrary way.
Refactored Survey expression utility subs that lookup values/scores/tags in
external assets.
Fixed bug whereby only highest precedence Survey expression was being evaluated
rather than letting them all run and do their own short-circuiting.
