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Use segment_info_update(|_ack) instead of sgmtinfo-update(|-ack). It
seems the design documents were not consistent about that, so,
obviously, different parts of code used different things.

Instead of generically any segment that is not local.

Rename readers_subscribed_ to readers_group_subscribed_.

Pass the sgmtinfo-update command to the client list manager and ack the
segment when done.

Not tested, as there's interaction with the command channel and threads
and external modules. Too much plumbing and too little functionality to
test.

Provide a callback to receive commands for foreign modules. The current
implementation is somewhat broken and unsatisfactory, but let's leave
that up for later. We need a way now.

It's already in public section there.

Don't warn about static cast of function pointer print.

Synchronize the workthread and main thread in the authoritative server,
by providing callbacks executed in the main thread after a work in the
workthread is completed.

To silence cppcheck.

Conflicts:
	src/bin/d2/Makefile.am
	src/bin/d2/d2_messages.mes
	src/bin/d2/tests/Makefile.am

This change added in response to a "make distcheck" failute on one
of the build systems.

These *.log and *.trs are created in all the tests/ directories when
gtest unittests are run with automake 1.13.4.

See: http://www.gnu.org/software/automake/manual/automake.html#Parallel-Test-Harness

Only OSX uses ".dylib" as a suffix for shared libraries.  Adjust
configure.ac so that the operating system can be better determined,
and ensure the hooks tests use the correct suffic for the test shared
libraries.