Style
Added disclaimer message
fixes the missing date
Removed useless code
Photo showing changed
Return after redirect or error
favicon added
More aggressive caching

Sets an expiration of 32 days for static contents and of 4 hours for the
main page and the help page.

Also sets 10 minutes for my dives and 4 hours for the assign confirmation
form.

This will make the browsers cache more aggressively (for longer periods)
and will reduce the load.
Corrected small detail