merge trunk
merge trunk: INST_TAILCALL has bug
Create Tcl 8.6.0 release branch
Declare TclOO portion of the Tcl API to be stable -> TclOO 1.0
merge trunk
merge trunk
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merge trunk:
merge trunk
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merge trunk
Tag 8.6.0 for release
Prefer to extract package data from the *contents* not the directory name.
TIP 400 suffered from the same segfaulting flaw as 3595576.
Segfaulting test and fix committed.
Various bits of cleanup, efficiencies, and comment documentation in tclVar.c