Split top-level ChangeLog by year. Everything before

        2001 is in ChangeLog.1, and since then all entries are in the
        respective year's ChangeLog.


git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/gnucash/trunk@11959 57a11ea4-9604-0410-9ed3-97b8803252fd

Author: cstim