recognize OCCT -dev and -beta versions

as such in version string

src/Mod/Part/App/AppPart.cpp

@@ -95,6 +95,9 @@ void PartExport initPart()
 {
     std::stringstream str;
     str << OCC_VERSION_MAJOR << "." << OCC_VERSION_MINOR << "." << OCC_VERSION_MAINTENANCE;
+#ifdef OCC_VERSION_DEVELOPMENT
+    str << "." OCC_VERSION_DEVELOPMENT;
+#endif
     App::Application::Config()["OCC_VERSION"] = str.str();
 
     // This is highly experimental and we should keep an eye on it