Added support for unbound UDP sockets, with readFrom() and writeTo().
C++ base support only; this commit breaks Java and Symbian platforms.

Conflicts:

	tools/idl2/maapi.idl
Unbound UDP: Android.
Unbound UDP: JavaME stub.
Unbound UDP: Symbian stub.
Fixed build errors in MSVC.
Unbound UDP: JavaME.
Added CONN_FAMILY_INET6. Partial implementation on Android.
Merge pull request #365 from fredrikeldh/master

Unbound UDP