Add header row to email opt in list; add default date
fix preview link generation for course reruns (PLAT-336)
Merge pull request #6233 from edx/adam/fix-preview-courseruns

fix preview link generation for course reruns (PLAT-336)
Merge pull request #6245 from edx/will/email-opt-in-updates

Add header row to email opt in list; add default date