Issue #22236: Tkinter tests now don't reuse default root window.  New root
window is created for every test class.

Fixed Tkinter images copying operations in NoDefaultRoot mode.

Tcl command names generated for "after" callbacks now contains a name of
original function.

--HG--
branch : 2.7
don't segfault when trying to fdopen() a fd for a dir (closes #22259)

Patch from Brian Kearns.

--HG--
branch : 2.7
fix some test_weakref tests to not rely on ref-counting (closes #22267)

--HG--
branch : 2.7
allow test to work on implementations not using ref-counting (closes #22265)

--HG--
branch : 2.7