Take JANA_HOME off of the plugin loader search path

src/libraries/JANA/Services/JPluginLoader.cc

@@ -73,17 +73,7 @@ void JPluginLoader::resolve_plugin_paths() {
         while (getline(envvar_ss, path, ':')) add_plugin_path(path);
     }
 
-    // 3. Next we look in the plugin directories relative to $JANA_HOME
-    if (const char* jana_home = getenv("JANA_HOME")) {
-        add_plugin_path(std::string(jana_home) + "/lib/JANA/plugins");  // In case we did a system install and want to avoid conflicts.
-    }
-
-    // 4. Finally we look in the JANA install directory.
-    // By checking here, the user no longer needs to set JANA_HOME in order to run built-in plugins 
-    // such as janadot and JTest. The install directory is supposed to be the same as JANA_HOME, 
-    // but we can't guarantee that because the user can set JANA_HOME to be anything they want.
-    // It would be nice if nothing in the JANA codebase itself relied on JANA_HOME, although we 
-    // won't be removing it anytime soon because of build_scripts.
+    // 3. Finally we look in the JANA install directory.
     add_plugin_path(JVersion::GetInstallDir() + "/lib/JANA/plugins");
 }