* NEWS: Typo. * doc/announce/ANNOUNCE-0.21: Add checksums.
* BLURB: Release update. * HACKING: Remove roadmap. * INSTALL: Release update. * NEWS: Add 0.21 section. * README: Release update. * ROADMAP: New file. * configure.sh: Release update. * doc/announce/ANNOUNCE-0.21: New file. * doc/mes.texi: Release update.