New MLDonkey release 2.8.4

- Ocaml 3.10 beta can now be used to compile MLDonkey, except GTK1 oldgui
- new Country-based statistics, command "costats"
- HTML interface now shows country flags, use option html_flags to disable
- Reduce RAM usage due to lower client_buffer_size default
- Telnet interface recognizes non-ASCII chars

Edonkey:
- mld_hash produces AICH hashes
- eMule SUI now works between machines with different endianness