return non-zero exit code if XML output fails to generate (issue #226), note additional files can be process in -help output #227
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add some "die" statements to texml so that if an XML output file
cannot be generated from any input file the script will exit with a non-zero return code, as is expected of unix-like programs that fail to run successfully. (noted in issue #226)
Also: modify the usage note (what the -help option will cause to be printed) to document that the script will process all filenames based as agruments to the script