…est-path

Issue249 Add Dijkstra's shortest path
Bypassing PR review

This might cause problems in some IDE's or Python environments due
to a name collision with the Queue class.

Includes entry widgets for operation arguments

…tries

Select all text in entries on FocusIn events and restrict graph edge weight range

…as-Queue

Renaming SimpleQueue.py to Queue.py

Show infinite cost with infinity symbol (except in trinket)

Issue226 Show hits as tooltips in floating windows

The map/unmap handler for the main window to make the adjacency
matrix follow along is now an add-on handler.

By setting debug mode, detailed event logs will be produced after
the first New graph operation.

Issue257 Fix adjaceny matrix in Windows
bypassing PR review

Issue157 Uniform hints

Issue253 Use other mouse buttons like Shift key
bypassing PR review

The array is slightly smaller now and the items being copied for sifting
up and down don't overlap their neighbors as much

Fixed the initialization of Table structures and using the specified
font for labeled arrows

Issue224 Fix overlapping items in heapify 
Bypassing PR review

…variables

Issue222 Fade local Tree234 variables during traverse
Bypassing PR review

When the main window is resized, the resize handler changes the
grid cell width and height for the selected visualization app
to follow the change.  Also always re-grid app windows with sticky
edges.

Also forced the menu button that shows the menu of visualization
apps to be hidden if a command line argument is used to select the
first app.

Tested only under macOS.

Include changes to the menu version that fix ttk issues with styles
and themes.

Issue225 Fix resizing issues with runAllVisualizationsMenu 
Bypassing PR review

…rollbars

Tweak canvas width when scrollbars are present

…ithm

The widgetDimensions method provides a slightly larger estimate of the
canvas' dimensions than getting the size from the visibleCanvas method.
That caused scrolling to not go far enough in some cases.

The algorithm for selecting a subset of bounding boxes that can be shown
within the visible canvas, was not thorough enough to explore all the
options needed.  Now it should find the maximum number of bboxes that
can be preserved.

…trinket

Issue207 Fix scrollToSee on Trinket
Bypassing PR review

…tion

Bringing this feature branch up to date with the changes from master

Refactor to have new() and display() methods like other visualization apps.
Addd values to validation messages and highlight text entry boxes
that have errors.

Nodes are now a subclass of drawnValue with named access to fields.
Nodes store their bounding box along with their coordinates and data.
Replaced use of counter by summing the data points in all nodes.

…PointVisualization

Basic QuadTree Class with insert, new, and showtree

…ertion

Issue82 Animate quadtree insertion and find exact
bypassing PR review

Added command line arguments for controlling the random seed and
inserting random points at launch for faster testing.

…items

Clear point label text entry for single click events

…cutable

Add command line options for the bundle ID, disk image name, and distribution
directory.  Build the disk image containing the visualization app, and put
the command line launchable app in a separate folder.