TODO

* Get average depth and sac for multiple dive tank sets working
* Display related info from other tables in dive details (i.e. shops, trips etc.)
* Extra profile charts (e.g. temperature, gas changes, Asc-/Descend rate, tank pressures, ppO2 etc.)
* Extra dive statistics (e.g. charts as per Diving Log)
* Improvements to the photo gallery
* Show which equipment items are due for service and/or O2 clean
* Protected access to overview and details of buddies
* Get a better RTF to HTML converter to fully support the RTF markup Diving Log can do