Switch to absolute imports to support direct execution of modules. Many

Switch to absolute imports to support direct execution of modules.  Many
IDLE modules have main() or test() functions which are essential for testing.

M    idlelib/AutoCompleteWindow.py
M    idlelib/UndoDelegator.py
M    idlelib/Bindings.py
M    idlelib/AutoComplete.py
M    idlelib/configHandler.py
M    idlelib/HyperParser.py
M    idlelib/ColorDelegator.py
M    idlelib/ObjectBrowser.py
M    idlelib/ZoomHeight.py
M    idlelib/PyShell.py
M    idlelib/ParenMatch.py
M    idlelib/Debugger.py
M    idlelib/configDialog.py
M    idlelib/StackViewer.py
M    idlelib/ReplaceDialog.py
M    idlelib/ScriptBinding.py
M    idlelib/GrepDialog.py
M    idlelib/EditorWindow.py
M    idlelib/FormatParagraph.py
M    idlelib/OutputWindow.py
M    idlelib/aboutDialog.py
M    idlelib/IdleHistory.py
M    idlelib/PathBrowser.py
M    idlelib/ClassBrowser.py
M    idlelib/CallTips.py
M    idlelib/FileList.py
M    idlelib/idle.py
M    idlelib/CodeContext.py
M    idlelib/SearchDialog.py
M    idlelib/RemoteObjectBrowser.py
M    idlelib/RemoteDebugger.py
M    idlelib/TreeWidget.py
M    idlelib/run.py
M    idlelib/Percolator.py
M    idlelib/macosxSupport.py