[interfacekit] memory leak in BApplication

I don't think it's much important, since as now we are not able to run 
BApplications on OBOS, anyway....
there is a memory leak in Application.cpp, in the InitData method.

in this part:

// AS_CREATE_APP:
// Attach data:
// 1) port_id - receiver port of a regular app
// 2) char * - signature of the regular app
PortLink::ReplyData replydata;
                        
PortLink *link=new PortLink(fServerFrom);
link->SetOpCode(AS_CREATE_APP);
link->Attach<int32>((int32)fServerTo);
link->Attach<int32>(_get_object_token_(this));
link->Attach((char*)signature,strlen(signature)+1);
status_t replyerr=link->FlushWithReply(&replydata);

As you see, the Portlink object is not deleted.
And here, as I told DW in a private mail about _BAppServerLink_, maybe it's 
better to allocate those Portlink objects on the stack, so you just don't care 
about their deletion.

I would've fixed it by myself, but since there are already two people working 
on the app server, I didn't want to break/interfere with their work :P

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