Change Note hwos TECH Firmware 3.08
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- Removed option 'ascent speed', ascent calculation is done with a fixed
  speed of 10 meters/minute now (equals the ascent speed limit by Bühlmann).

- Improved calculation accuracy of the initial ascent. Remark: this will
  have a slight impact on the resulting deco schedule compared to firmware
  3.07.

- The deco calculator now figures in the salinity setting.

- Aligned logbook and last dive summery of avg and max depth regarding
  rounding and incorporation of salinity setting.

- Done some fine-tuning of depth outputs when using imperial units (feet).

- In dive mode, sometimes the temperature was not shown any more after a
  gas change - fixed now.

- The menu system around setting up the dive mode & settings has been
  decluttered. All settings are now sorted into the groups dive setup,
  deco setup, SAC (gas needs) setup, ppO2 setup and stops & depths setup.

- Fixed the urge of the better gas hint to always favor one specific gas
  out of a set of two or more gases that have the same change depth.

- For dives done on firmware >= 3.09 the logbook will have one more page
  showing the tissue pressures and supersaturation levels as of at the
  end of dive (i.e. when surfacing).

- As long as a gas or diluent is currently selected as breathed, it can
  not be set into the lost state any more.

- When changing the battery or doing a cold start, the current CNS value
  does not get lost any more.

- During loading of a new firmware the clock will not loose time any more
  (on old firmware it became late by about 15 sec on each firmware update).

- When run from a 3.6 V battery (either replaceable or built-in), the
  surface mode timeout is now extended to 4 minutes before going to sleep
  mode. If the OSTC is run from 1.5 V disposables, the timeout remains at
  the previous 90 seconds to save on battery runtime.

- Internal improvement: the code for the internal storage system and for
  the communication system (firmware uploading, dive data downloading)
  has been re-factored to secure maintainability for the next years to come.

- Internal improvement: the scheduler for the dive mode calculation plans
  (fTTS, bailout) has been completely rewritten for better maintainability.

- Brand new feature: Cave Mode. See supplemental manual for further details.