Version 3.1.6 (2019-07-16)
==========================
  * Fixed wrong size of image data and file in result screenshot header.
  * Adjusted menu back behavior in case characteristic values remain unchanged.
  * Straightened memory allocation in configuration menus.

Version 3.1.4 (2018-12-27)
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  * Eliminated memory management flaw which could cause system failures.

Version 3.1.2 (2018-10-05)
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  * Possible stability issue eliminated.
  * Default intensity limit changed from medium to low.

Version 3.1.0 (2018-01-14)
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  * Measurement of full burning time t0.0 (along t0.1 until t0.9) added.

Version 3.0.0 (2018-01-01)
==========================
  * Selectable 2nd charact. value from t0.2 to t0.9 (along with t0.1).
  * Luminous exposure added as measurement basis alternative to brightness.
  * User adjustable minimum required brightness intensity.
  * Measurement readings (next to screenshots) exportable to SD memory card.
  * Flash trigger may be enabled/disabled by means of the configuration menu.
  * Color steps in brightness curve as additional visualization option.
  * General visual enhancement of optional visualization grid.

Version 2.16.2 (2017-10-17)
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  * Improved detection and reporting of incorrectly formatted SD memory cards.
  * Refined determination of t0.1 and t0.5 for alternating signals (e.g. HSS).
  * Extended visualization by measurement data prior to t0.1 range.

Version 2.16.0 (2017-05-18)
===========================
  * Minimum t0.1 duration was shortened down to 1/120000 sec.
  * Additional automatic long-run mode for t0.1 durations up to 1/5 sec.
  * Denominator of durations from 1/100 to 1/10 shows one decimal place.
  * Denominator of durations longer than 1/10 shows two decimal places.
  * Consider t.x visualization settings in error messages.

Version 2.15.2 (2016-07-29)
===========================
  * Verify screenshot file written to SD memory card.
  * Turn off status LED before re-enabling TFT after having written screenshot.