- Update to version 1.24:
  + Text labels can now include Python expressions inside %{{ }}%
  + Added built-in functions DATE([fmt]), TIME([fmt]), FILENAME()
    and BASENAME() when evaluating expressions, which are useful
    when used in labels
  + Added Python dictionary ENVIRON when evaluating expressions,
    to obtain values from environment variables
  + Added DATA(name, [part]) function to expression environment
    for accessing values from datasets, useful for function
    evaluation or labels
  + Added SETTING(path) function for expression evaluation to
    obtain values of settings
  + Added ESCAPE(text) function to environment, which allows LaTeX
    special characters to be displayed in labels
  + Add fractions and percentages units to polar plot
  + Allow number of spokes to be varied in polar plot
  + Widgets can be clicked holding down shift or ctrl, to add or
    toggle their selection
  + Add K. Moreland's cool-warm colormap (thanks to S. Richardson)
  + Added further green-map, blue-darkred, blue-darkorange,
    brown-blue and blue-orange colormaps from Oregon geography
    dept.
  + Add logarithm and exponential dataset plugins
  + Add Wipe() command to embedding interface to clear document
  + Add File->Reload menu option to reload from saved document
  + Add tooltip to items in FieldWidget showing widget path
  + Bux fixes:
    - Fix transparency with bar plot
    - Use getcwdu() for python2 to avoid bugs combining paths
    - Handle inf/nan when converting to human readable form in plots

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