Create Tcl 8.6.0 release branch
Declare TclOO portion of the Tcl API to be stable -> TclOO 1.0
merge trunk
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Tag 8.6.0 for release
Prefer to extract package data from the *contents* not the directory name.
Various bits of cleanup, efficiencies, and comment documentation in tclVar.c
merge trunk, update changes and re-tag
merge release
Turn pkgb.so into a Tcl9 interoperability test library: Whatever Tcl9 looks like, loading pkgb.so in Tcl 9 should either result in an error-message, either succeed, but never crash. 
Eliminate unnessarcy static HasStubSupport() and isDigit() functions, just do the same inline.
Make pkgb.so loadable in Tcl 8.4 as well. 
Eliminate unnessarcy static HasStubSupport() and isDigit() functions, just do the same inline.