Sync

- Added server credential handling.
- Added server error handling.
- Added task download handling.
- Added backlog truncation and synch_key handling.
- Added display of server-side messages.
- Cleaned up NEWS file for 2.3.0.
- Removed duplicate info in diagnostics command output.

src/commands/CmdDiagnostics.cpp

@@ -95,9 +95,6 @@ int CmdDiagnostics::execute (std::string& output)
 #else
          STRING_CMD_DIAG_UNKNOWN
 #endif
-      << "\n"
-      << STRING_CMD_DIAG_SERVER << ": "
-      << context.config.get ("taskd.server")
       << "\n\n";
 
   // Compiler.