Update libtool library version

Some functions in util.c were previously generated for each template
type (unnecessarily) but are no longer template generated. This
means that interfaces have only been removed, and the version has
been update accordingly.
Update configure.ac and NEWS for new version
README: Update sentence about removed dependencies
contrib: Update Fedora RPM spec for new release
Update macports Portfile for new release
Merge updates from release branch for 2.5.10.2