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+- Add popup dialog box when "write units" to explain that writing
+ goes to standard output. to write to filename.txt gonvert must
+ be started in console mode as follows:
+ gonvert > filename.txt
+
+- add AWG (American Wire Gauge) conversions from Diameter/length and Area.
+
+- add volume of a sphere with diameter given in:
+ - inches, feet, metres, cm.
+
+- add subcategories, especially for common measures:
+ - length,area,mass: all,foriegn,ancient
+
+- add saveable customisable units for derived unit categories:
+ - accelation (length/time²)
+ - angular velocity (angle/time)
+ - Computer data flow rate (computer data/time)
+ - density (mass/volume)
+ - energy | work ( force · time)
+ - flow dry/liquid (volume/time)
+ - velocity (length/time)
+ - fuel efficiency: (length/volume) (NEW*)
+ - etc...
+ - probably use pickle method
+ - probably use pop up window to define numerator and denominator units
+ each with pull down selections.
+
+- detailed instructions for creating your own conversions
+- Morse code converter
+- add: - angular acceleration
+ - torque
+- add ASCII to computer numbers (convert Hex to ASCII)
+
+- Add bookmarks (certain categories and units preselected, Ex:
+ ^A add bookmark
+ ^B view bookmarks
+ edit bookmarks
+ ^right ^left to go to previous and next bookmarks
+ command line option to start up with bookmark
+
+- Add history (possibly similar to bookmarks)
+ - a popup dialog showing last x pairs
+ - ability to remove a pair from history
+ - display group:unit1[,unit2]