V2 llmessage merge, incl. llcommon requisites.

Excluded llareslistener, as that appears to only be present for unit-testing
Excluded new SSL methods because, well, they don't work right reliably in v2 for me

indra/llmessage/lltransfermanager.cpp

@@ -1195,6 +1195,7 @@ LLTransferTarget::LLTransferTarget(
 	mType(type),
 	mSourceType(source_type),
 	mID(transfer_id),
+	mChannelp(NULL),
 	mGotInfo(FALSE),
 	mSize(0),
 	mLastPacketID(-1)