Enhance number-of-classes selection mechanism

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There are only a few built-in classification types that support a user-selected 
number of categories/classes.  These are:
- Quantile, Natural Breaks, and Equal Intervals
- Custom Categories are created by the user, but are only modifiable through 
the Category Editor.  Unique Values depends on the data rather than being 
chosen by the user.

Instead of raising a dialog box prompting the user to specify the number of 
categories when switching to Quantile, Natural Breaks or Equal Intervals, the 
numbers 1 through 10 will be presented as a submenu.  For the Rates dialog, we 
will add a spin dialog to specify numbers 1 through 10.

In this way, the user will be easily able to change the number of categories 
within an existing view, rather than having to create a new view.

Original issue reported on code.google.com by mmcc...@gmail.com on 4 Apr 2014 at 2:58

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Original comment by mmcc...@gmail.com on 4 Apr 2014 at 3:02

• Changed title: Enhance number of classes selection mechanism

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Original comment by mmcc...@gmail.com on 4 Apr 2014 at 6:02

• Changed title: Enhance number-of-classes selection mechanism
• Changed state: New

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Original comment by lanse...@gmail.com on 25 Jun 2015 at 6:47

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Fixed

Original comment by jkosc...@asu.edu on 9 Jul 2015 at 7:39

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Original comment by jkoschin...@gmail.com on 9 Jul 2015 at 7:41

• Changed state: Fixed