Log Message:
ham/xlog updated to 2.0.15

- Changes for xlog version 2.0.15 - 2017-nov-08
  * Clean up warnings reported by user from a macOS build
  * Updated cty.dat to 20171030
  * 60m is now consistently referred to as "5" (not 5.2 or 5.3)
  * Upgraded to ADIF version 3.0.6
  * Cleaned up Glib Critical and Glib Warnings (that I could create)
  * Added all modes and submodes
  * ADIF3 output is now supported, ADIF2 output has been removed
  * ADIF Import has been updated
  * added adif_ok to xlog.cfg to indicate ADIF3 update of bands,
    modes, and scoringbands has oc curred
  * Users will see new defaults restored if they have customized via:
      Settings->Dialogs->Scoring
      Settings->Preferences->General comma separated list of modes
      Settings->Preferences->General comma separated list of bands
  * Fixed bands in scoring window
  * Added feature: sort log by callsign