[libvoikko] libvoikko 4.0, voikko-fi 2.0 and libreoffice-voikko 5.0

[Harri Pitkänen]

These new major versions have now been released:

 * libvoikko 4.0 (no changes after 4.0rc2)
 * voikko-fi 2.0 (no changes after 2.0rc2)
 * libreoffice-voikko 5.0 (no changes after 5.0rc1)

Release notes and source code are available at http://voikko.puimula.org

Note that many places on the website (build instructions etc.) still need to 
be updated to reflect the changes made in these releases.

Harri