Fix C99 comment-ism breaking the native AIX compiler. HPUX likely as well.
Improve reliability of test httpold-4.12.  Thanks AF!
last-moment fix for FreeBSD from Pietro Cerutti
fix for perf bug detected by Kieran (https://groups.google.com/forum/?fromgroups#!topic/comp.lang.tcl/vfpI3bc-DkQ)
fix for perf bug detected by Kieran (https://groups.google.com/forum/?fromgroups#!topic/comp.lang.tcl/vfpI3bc-DkQ)
merge 8.4
merge 8.5
Eliminate NO_VIZ macro as current zlib uses HAVE_HIDDEN in stead.
One more last-moment fix for FreeBSD by Pietro Cerutti
Stack cleanup works now even in the most evil expansion cases.
Even better tests
merge trunk