- Added getter to IfcFile object

- fixed wrong operator to judge plan angle unit is not exist.
- guessed plane angle unit stay in a file processing.

src/ifcgeom/IfcGeomObjects.cpp

@@ -639,3 +639,7 @@ int IfcGeomObjects::Progress() {
 std::string IfcGeomObjects::GetLog() {
 	return Logger::GetLog();
 }
+
+IfcParse::IfcFile* IfcGeomObjects::GetFile() {
+  return ifc_file;
+}