Changed interval definition

  -t, --interval=TIME     Time interval from start_time (greater than zero).
                          TIME is in seconds, otherwise append 'm' for minutes
                          'h' for hours or 'd' for days. [1 sec .. 31 days]


git-svn-id: file:///home/quintiliani/svncopy/nmxptool/trunk@765 3cd66e75-5955-46cb-a940-c26e5fc5497d