Revise TclNREvalObjv so that pre-resolution of the Command by a caller
does not force suppression of exception handling.  Let those be separable
demands.  Aim is to bring TclObjInvoke*() into the fold.
Use the double-secret iPtr->lookupNsPtr field to get post-enter-trace
re-resolutions of commands done in the right context for oo forwards.
added some test cases, based on bug report
merge trunk
New internal routine TclNRInvoke() - NR-enabled path through the machinery
behind invokehidden commands.
More revisions let multi-interp test case work, but at cost of panics
and segfaults.  Pushing the NRE-envelope.
More progress.  NR-enable [interp] and [$slave], completely with
invokehidden subcommand.  Test suite passes with no errors.
merge trunk
Possible improvement in light of [86ceb4e2b6].
[a16752c252] Correct failure to call cmd deletion callbacks.
[a16752c252] Correct failure to call cmd deletion callbacks.
merge trunk
merge trunk
[3610404] Re-resolution of command after enter traces invalidate epoch.
Make sure context is such that correct resolution happens.
merge trunk
Add several tests to check consistency of stack traces.
merge trunk
The fix for [3610404] leads to a simplification in the implementation of
forward methods.
merge trunk
Make sure the errors raised by execution traces become errors raised by
the traced command, as documented.  Deletion of the traced command was
supressing that.