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Added datetime conversion dialog
Changes to make more compatible with matplotlib 2.0
Can now plot grouped single plots for some plot types (line, bar, scatter)
Fixed sharey, sharex for grouped plots
Added ability to choose pre-defined mpl styles
Fix to memory leak on redraws
Changes to right click copy behaviour
Fix for displaying small floats
Added floating precision to table preferences
Clipboard bug fix
Improvement to merge dialog
Fixes to widget styling issues on linux
Added duplicate column removal in clean data
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