interpolate output refs for readable form view
always show plan credits
Merge pull request #3299 from dimagi/better-get_questions-outputref

interpolate output refs for readable form view
Merge pull request #3300 from dimagi/plan-credit-fix

always show plan credits
Merge branch 'master' into toggle-readable-raw

Conflicts:
	corehq/apps/reports/formdetails/readable.py