(usage, main): Make it "lstxns" instead of "lstxn", because more intuitive and consistent with "lsrevs".
(usage, main): Make it "lstxns" instead of "lstxn", because more
intuitive and consistent with "lsrevs".

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion