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/llcommon/llindraconfigfile.h

@@ -54,7 +54,7 @@ private:
     static std::string filename();
 
 protected:
-	/* virtual */ void loadFile();
+	/* virtual */ bool loadFile();
 	LLSD mConfig;
 };