NZMATH 0.6.0

A new version 0.6.0 was released yesterday.
There are 4 new modules: arygcd, bigrange, cubic_root and factor.ecm,
though update of quad module is postponed.

The source and manual:
http://tnt.math.metro-u.ac.jp/nzmath/NZMATH-0.6.0.tar.gz
and test:
http://tnt.math.metro-u.ac.jp/nzmath/NZMATH-test-0.6.0.tar.gz