Reset DB feature

[pavelskipenes]

Add new feature where db is being reset and getting ready for next year.
Transactions:

• TRUNCATE svommer_web.access_log
• TRUNCATE svommer_web.friday_beer
• TRUNCATE svommer_web.orders
• Generate CIN hash for each user in svommer_member.members and save it to svommer_member.member_CIN.
• TRUNCATE svommer_member.members
• DELETE FROM svommer_web.friday_beer WHERE last_used + 5 years > NOW()