version 0.7.6 (SH Jan 10 2020)
- Add move files logic with 3 configurable target folders

version 0.7.5 (SH Jan 10 2020)
- A bit more safety when loading files:
  Limit the number of files to scan to something reasonable (~1000)
  Wrap PhotoImage in try...except to avoid out-of-memory

version 0.7.4 (SH Jan  9 2020)
- Using ttk sliders instead of unthemed tk sliders

version 0.7.3 (SH Jan  8 2020)
- zoom in viewer window using mouse wheel
- class variables in condition modules

version 0.7.2 (SH Jan  7 2020)
- reduced maximum thumbnail size to avoid running out of memory
- more systematic variable naming scheme
- removed more code duplication from condition modules

version 0.7.1 (SH Jan  6 2020)
- fixed bug in initialising conditions that triggered many onChange events

version 0.7.0 (SH Jan  6 2020)
- removed more duplicate code using decorators in controller
- removed dependencies on statistics module
  * small speed up
  * no more dependency on python 3.8 for statistics.quantiles
  
version 0.6.5 (SH Jan  5 2020)
- deal with matching groups as dicts, much cleaner implementation
- results are now sorted by filename for each row of matches and by
  filename for the first shown image
  
version 0.6.4 (SH Jan  4 2020)
- better regrouping algorithm for reducing the series of matches
- further compacting of condition modules

version 0.6.3 (SH Jan  3 2020)
- Small layout improvement
- fixed bug in file delete in viewer windows

version 0.6.2 (SH Jan  2 2020)
- options to configure thumbnails
- fixed bug in match-making

version 0.6.1 (SH Jan  1 2020)
- removed duplicate code in condition modules. They are now faster and
  much cleaner in design
- Hiding or showing button below thumbnails without recalculating thumbnails

version 0.6.0 (SH Dec 31 2019)
- use ttk for theming
- remove most of the custom style for better fit with host OS
- clicking anywhere in the thumb pane deselects

version 0.5.2 (SH Dec 30 2019)
- made imports relative

version 0.5.1 (SH Dec 30 2019)
- removed ImageHash dependency
- replaced dhash (horizontal and vertical) versions by my own pure python version

version 0.5.0 (SH Dec 27 2019)
- fully functional version
- adapted some text to be more user friendly and less technical
- merged color matching routines

version 0.4.3 (SH Dec 26 2019)
- whitespace fixes
- allow showing 16bit grayscal pngs
- some code cleaning

version 0.4.2 (SH Dec 19 2019):
- use get/set consistently for configuration module
- fix bug not showing last remaining photo
- added some tool tips to inform about hashing values

version 0.4.1 (SH Dec 17 2019):
- small bugs in the requirements specifications
- added NEWS file

version 0.4 (SH Dec 16 2019):
- first functional version uploaded to PyPi
