new talloc interface in Samba4

[tridge at samba.org]

A number of people have asked for explanations of the new talloc
interface in Samba4. I have written a document explaining the API in
detail, which you can view here:

  http://samba.org/ftp/unpacked/samba4/talloc_guide.txt

The talloc API is becoming a more and more important part of the
internals of Samba4, so if you want to get involved in Samba4
development then reading the above document is essential.

Cheers, Tridge