added work-around for chrome bug related to re-uploading files after error
added work-around for chrome bug related to re-uploading files after error

radiasoft/sirepo,mkeilman/sirepo,radiasoft/sirepo,radiasoft/sirepo,mkeilman/sirepo,radiasoft/sirepo,mkeilman/sirepo,mkeilman/sirepo,radiasoft/sirepo