Tcllib 2.0 released.

Tcllib 2.0 released.

Tcllib Release 1.21 work integrated with trunk. Released.

Brought RC into sync with trunk.

Updated READMEs to match work on
- blowfish
- dns
- httpd
- markdown
- profiler
- struct::matrix
- tcl::chan::halfpipe

Continued work on release 1.20.

Updated READMEs:
- Deprecated packages, stages of deprecation
- change commentary

Fixed mismatched version numbers:
- html
- math::calculus

Minor fixes in docs and other files.

Fix access of amazon-s3 tests to their local config file. Still somet…

…hing to do about AWS key setup.

Cherrypicked [1da4d5eaab] over into the release. Bumped version, upda…

…ted related materials

Cherrypicked [1da4d5eaab] over into the release. Bumped version, upda…

…ted related materials

Added tool to remake the internal certs. Updated certs. Added xz to s…

…et of distribution tarballs. Metadate files updated.

Updated list of PACKAGES