Log Message:
Changes 3.0.15:
* Add provision for printing and viewing the logfile
* Make the expose event handler for the drawing area of the "Fax
  from socket" notifier more efficient
* Move PrintManager class to utils sub-directory as FilePrintManager
  class and provide new TextPrintManager class
* Correctly show help dialog for GTK+ print system checkbox in
  settings dialog
* Explicitly forbid copying of IntrusiveCounter and
  IntrusiveLockCounter class objects
* Do not initialise the pthread_cond_t object in a Thread::Cond
  object if the call to pthread_condattr_setclock() fails (this
  avoids a possible resource leak)
* Improve GError handling where relevant
* Change use of g_list_append() to g_list_prepend()
* Greek translation updated.