Remove last vestiges of autoconf; add VERSION

The only reason this is still autoconf is to support --prefix and
to work on platforms that don't have a working install(1) or a
mkdir -p.  We don't care about those platforms.

Convert Makefile.in to a trivial Makefile, and add a VERSION file
for use with the new build system
Merge branch 'master' into debian
Package 10.2.1

This includes changes to the upstream build system, as well
as correcting the version in install.rdf to 10.2.1