Solving issue 1730: "Long startup time / all files on all mounts are scanned while opening". The ICC profile's directory scanning is no more recursive.

rtengine/iccstore.cc

@@ -248,7 +248,11 @@ void ICCStore::loadICCs(Glib::ustring rootDirName, bool nameUpper, std::map<std:
                             }
                         }
                     }
-                } else qDirs.push_front(fname);  // for later scanning
+                }
+                // Removed recursive scanning, see issue #1730.
+                // To revert to the recursive method, just uncomment the next line.
+
+                //else qDirs.push_front(fname);  // for later scanning
             }
             delete dir;
         }