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List of additions/changes
 1. EditorWindow uses LineNumber.Text instead of tkinter.Text.
 2. Added linenumber canvas to IDLE windows except PyShell
 3. Some info about LineNumber.Text
 a) Inherits tk.Text
 b) Generates <<Changed>> virtual event, when insert, delete, replace,
 cursor changes position, window resized, scrolled etc. Nothing else
 is affected. The result of the original call is returned.
 4. LineNumber.LineNumberCanvas info
 a) font_color and breakpoint_color have default values
 b) Linenumber and breakpoints disabled by default. Instantiating
 a LineNumberCanvas object does not pack it.
 c) Pack it programmatically by calling its "attach" method.
 Compulsorily supply the text widget to attach to.
 Supply other parameters like font_color, background, 
 breakpoint_color as necessary.
 d) Unpack using "detach" method.
 e) Breakpoint feature is enabled only if LineNumberCanvas can 
 "see" an EditorWindow instance called "editwin" as its attribute.
 It(editwin) should implement set_breakpoint(linenumber) and 
 clear_breakpoint(linenumber) methods. EditorWindow responsible
 for binding breakpoint action on the canvas to LineNumberCanvas'
 toggle_breakpoint method.
 f) Contains a htest for GUI testing linenumbering and breakpoints.
 g) Any valid color can be set for linenumber canvas' background,
 its font color and breakpoint color. NS: Breakpoint does not have
 a background color.
 h) Linenumber canvas enabled by default.
 5. Linenumber preferences in configDialog's "General" tab.
 Highlight preferences in configDialog's "Highlight" tab.
 6. Other changes
 a) Refactoring of PyShell's set_breakpoint_here, set_breakpoint,
 clear_breakpoint_here and clear_breakpoint to make more consistent.