Announcement: Expat 2.1.0 Beta can be tested

Available from: https://sourceforge.net/projects/expat/files/expat/2.1.0/.

This release was triggered by a hash table DOS attack fix, it also includes
accumulated bug fixes and some changes to the build system - using autoreconf
instead of the old code in buildconf.sh.

Also added a conditional feature to make byte offsets for attributes and
attribute names available.

What's missing: Documentation updates (Changes file, reference.html)

Karl