Update of the doc/el_GR.ISO8859-7 documentation, to catch up with
the latest developments in the Greek translation team. This one
brings in many resync/MFen changes for articles, and a new book:

The Greek Handbook

We still have a lot of work to do in the Handbook tree, but the
work of the following people has been instrumental in getting us
so far already:

Giorgos Iordanou
Manolis Kiagias
Nikos Kokkalis
Leonidas Tsampros
Baggelis Typaldos