Add option to disable GUI commands to NoFairMQ histo server binary

Tested in my local copy on mfles:

• without the new option, the three commands are visible in the web-browser
• with the new option --hideguicmds, the commands are not there

services/histserv/app/Application.cxx

@@ -69,18 +69,20 @@ Application::Application(ProgramOptions const& opt) : fOpt(opt)
   fServer->Register("/", fUiCmdActor.get());
   fServer->Hide("/UiCmdActor");
 
-  fServer->RegisterCommand("/Reset_Hist", "/UiCmdActor/->SetResetHistos()");
-  fServer->RegisterCommand("/Save_Hist", "/UiCmdActor/->SetSaveHistos()");
-  fServer->RegisterCommand("/Stop_Server", "/UiCmdActor/->SetServerStop()");
-
-  /*
-  fServer->RegisterCommand("/Reset_Hist", "this->ResetHistograms()");
-  fServer->RegisterCommand("/Save_Hist", "this->SaveHistograms()");
-  */
-
-  fServer->Restrict("/Reset_Hist", "allow=admin");
-  fServer->Restrict("/Save_Hist", "allow=admin");
-  fServer->Restrict("/Stop_Server", "allow=admin");
+  if (!fOpt.HideGuiCommands()) {
+    fServer->RegisterCommand("/Reset_Hist", "/UiCmdActor/->SetResetHistos()");
+    fServer->RegisterCommand("/Save_Hist", "/UiCmdActor/->SetSaveHistos()");
+    fServer->RegisterCommand("/Stop_Server", "/UiCmdActor/->SetServerStop()");
+
+    /*
+    fServer->RegisterCommand("/Reset_Hist", "this->ResetHistograms()");
+    fServer->RegisterCommand("/Save_Hist", "this->SaveHistograms()");
+    */
+
+    fServer->Restrict("/Reset_Hist", "allow=admin");
+    fServer->Restrict("/Save_Hist", "allow=admin");
+    fServer->Restrict("/Stop_Server", "allow=admin");
+  }
 
   // Provide signal handling for external interruptions
   // NOTE: SZh 02.04.2024: