the old code updates things based on the info in VERSION. I've
kept this, but added a second token in VERSION, "beta". configure
will now parse VERSION into $VERSION and $RELEASE. Whatever the
second token is will be appened to the "release" target tar and
zip afiles, and will be used by dist/newversion to
create dist/tiff.version.
* Removed distinction between alpha and release targets in Makefile.in.
* added release.stamp target, which tags cvs tree, and updates
"RELEASE-DATE"
* added releasediff target, which diffs tree with source as of
date in "RELEASE-DATE"
* Ticked up version to 3.5.2 (alpha 01 -- but I think we'll moving
away from alpha/non-alpha distinctions).
* updated html to reflect release