mouse and cursor selection in ACWindow implemented; double Tab inserts current
selection and closes ACW (similar to double-click and Return); scroll wheel now
works in ACW. Added AutoComplete instructions to IDLE Help.
Backport of r53679
A idlelib/AutoCompleteWindow.py
A idlelib/AutoComplete.py
A idlelib/HyperParser.py
M idlelib/PyShell.py
M idlelib/ParenMatch.py
M idlelib/configDialog.py
M idlelib/EditorWindow.py
M idlelib/PyParse.py
M idlelib/CallTips.py
M idlelib/CallTipWindow.py
M idlelib/run.py
M idlelib/config-extensions.def
A idlelib/MultiCall.py