Command line tools for XML sync testing between languages

[alfsb]

This PR rewrites the last of old qaxml tools into something that is almost independent of "lib revcheck" code, and adapted to be run in all translations.

After this PR is merged, and new tools announced, the old tools/code removing will be possible. The only dependence renaming are /lib/RevtagParser.php, that is a isolated file, and SyncFileList calling into RevcheckRun, that can be replaced with a simple .xml listing, as the new tools now inspect all files, and does not filter for TranslatedOk anymore.