Be more targetted on when we load DRC Rules for better performance.

pcbnew/pcb_edit_frame.cpp

@@ -1041,7 +1041,16 @@ void PCB_EDIT_FRAME::SetActiveLayer( PCB_LAYER_ID aLayer )
 void PCB_EDIT_FRAME::onBoardLoaded()
 {
     DRC_TOOL* drcTool = m_toolManager->GetTool<DRC_TOOL>();
-    drcTool->Reset( TOOL_BASE::MODEL_RELOAD );
+
+    try
+    {
+        drcTool->GetDRCEngine()->InitEngine( GetDesignRulesPath() );
+    }
+    catch( PARSE_ERROR& pe )
+    {
+        // Not sure this is the best place to tell the user their rules are buggy, so
+        // we'll stay quiet for now.  Feel free to revisit this decision....
+    }
 
     UpdateTitle();
 

pcbnew/tools/drc_tool.cpp

@@ -62,19 +62,6 @@ void DRC_TOOL::Reset( RESET_REASON aReason )
         m_pcb = m_editFrame->GetBoard();
         m_drcEngine = m_pcb->GetDesignSettings().m_DRCEngine;
     }
-
-    if( aReason == MODEL_RELOAD && m_pcb->GetProject() )
-    {
-        try
-        {
-            m_drcEngine->InitEngine( m_editFrame->GetDesignRulesPath() );
-        }
-        catch( PARSE_ERROR& pe )
-        {
-            // Not sure this is the best place to tell the user their rules are buggy, so
-            // we'll stay quiet for now.  Feel free to revisit this decision....
-        }
-    }
 }