BufferProvider: remove the problematic mismatched API

This API function was the reason why the handling of
`OutputSlot` and `BufferProvider` do not mesh up well,
so that the former could not yet be integrated properly
into the engine.

''Obviously the proper solution still needs to be implemented''

src/vault/out/output-slot.cpp

@@ -98,17 +98,5 @@ namespace out   {
   }
   
   
-  void
-  DataSink::emit (FrameID frameNr, BuffHandle& data2emit, TimeValue currentTime)
-  {
-    OutputSlot::Connection& connection = impl();
-    if (connection.isTimely(frameNr,currentTime))
-      connection.transfer(data2emit);
-    else
-      connection.discard(data2emit);
-  }
-  
-  
-  
   
 }} // namespace vault::out

src/vault/out/output-slot.hpp

@@ -162,7 +162,6 @@ namespace out  {
       
     public:
       BuffHandle lockBufferFor(FrameID);
-      void emit(FrameID, BuffHandle&, TimeValue currentTime = Time::ANYTIME);
       
       
       friend bool operator== (DataSink const& sink1, DataSink const& sink2)