New ski area: Kvitfjell
Fixed unused starthuts being visible in val d’isere.
Fixed player registration not retrying after a communication problem.
Fixed login to not allow empty passwords or malformed email addresses.
Fixed autologin to return to login in case saved login data is not valid.
Fixed an error when low-mem-mode gets enabled during loading.
Added display of active/future challenges to main and challenge screens.
Added player statistics to player screen.