remove unneccessary duplication
merge-mark
Add dummy (undocumented) TclCanceled function in stub table (not exported as symbol or macro), which always returns TCL_OK. Needed for Tk 8.5.14 when running in Tcl 8.6 for properly clean-up when a (Tcl 8.6) thread is canceled.
merge-mark
renumber flag values, improve doc.