Hi,

I'm pleased to announce the completion of the reference implementation
of TIP 348, bringing substituted tracebacks ala Python/gdb. Please
review.

One nice thing is the very small overhead:

   - zero (one boolean test in Tcl_LogCommandInfo) when not enabled
   - very little when enabled:

   for {set i 1} {$i<10} {incr i} {
    proc f$i x "f[expr {$i+1}] \$x"
   }
   proc f10 x {error F10:$x}

   time {catch {f1 12}} 10000
   ->  75.4951 microseconds per iteration

   set ::tcl::useErrorStack 1

   time {catch {f1 12}} 10000
   ->  79.7074 microseconds per iteration

   puts $::tcl::errorStack
   {f10 12} {f9 12} {f8 12} {f7 12} {f6 12} {f5 12} {f4 12} {f3 12}
{f2 12} {f1 12}

This is a 6% overhead in a 10-level catch with empty hulls as procs.
Should be vanishingly small if we add any real meat.

-Alex

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