Fix passing lists and tuples of strings containing special characters
'"', '\\', '{', '}' and '\n' as options to tkinter.ttk widgets.

Allow ttk.Treeview.insert to insert iid that has a false boolean value.
Note iid=0 and iid=False would be same.

It was deprecated in 3.6.

* Fix multiple typos in code comments

* Add spacing in comments (test_logging.py, test_math.py)

* Fix spaces at the beginning of comments in test_logging.py

Defer removing old behavior to 3.8.
Document new feature of selection_set() and friends.

bpo-31135: Call the parent destroy() method even if the used
attribute doesn't exist.

The LabeledScale.destroy() method now also explicitly clears label
and scale attributes to help the garbage collector to destroy all
widgets.

between instances of OptionMenu.

Ran the docstrings through spell checker, and fixed spelling issues.

by representing the scale as float value internally in Tk.  tkinter.IntVar
now works if float value is set to underlying Tk variable.

for readability (was "`").

a workaround to Tix library bug.

* tracing in the "u" mode now works
* trace_vdelete() with wrong mode no longer break tracing
* trace_vinfo() now always returns a list of pairs of strings

tkinter.Variable class.  They replace old methods trace_variable, trace,
trace_vdelete and trace_vinfo that use obsolete Tcl commands and might
not work in future versions of Tcl.

tkapp.split() in the tkinter package.

and selection_toggle() of ttk.TreeView now allow to pass multiple items as
multiple arguments instead of passing them as a tuple.  Deprecated
undocumented ability of calling the selection() method with arguments.

represented as a compination of known flags.

containing spaces.

and recognizirable.

Most fixes to Doc/ and Lib/ directories by Ville Skyttä.

and tk_bindForTraversal().

Minimal supported Tcl/Tk version is 8.4, and this is checked in _tkinter.c.