addfiles runs upload file tests

have addfiles run upload test (e.g. for updating zip comments)

added feature label

assigned to @rswindell

mentioned in commit e2f5762b

As of today, testable file types are only applied to uploads via the Terminal server (via sbbs_t::uploadfile()), so not the FTP server or addfiles[.js] or any other method of adding files (are there any?).

Since addfiles[.exe] is deprecated, the proper solution here would be to update js_filebase.c to either add a new method or update the add() method to execute the tests. Similar improvements to the ftpsrvr.c would be indicated too.