Automake bug

  * Versions 1.12, 1.13, 1.14xxx of Automake introduces
    a bug that precludes the use of $(srcdir) within
    the "TESTS = " line of a Makefile.am file.
64 bit compile warnings

  * corrected code to eliminate 64 bit compiler warnings
XML parser

  * Pre-process the xml text to remove all embedded comments
  * LOG_ERROR all occurrences of mangled xml tags in the file
    - <TAG> ... no </TAG>
    - Tag not a member of the parent tag set
    - Unknown tag
    - Mismatched tags, <TAG>...</ATAG>; probably a typing error
      or not using an xml editor to prepare the file.
initialize active_modem

  * initialize active_modem pointer to point to
    an instance of NULLMODEM, before any other threads
    or UI are started.
  * eliminates active_modem pointing to a NULL pointer
    and being accessed by a thread external from the
    thread which initializes the active modem.  This
    segmentation fault seems associated with an OS
    which manages threads over multiple cpu cores.
Version 3.21.74

  * Maintenance release
Merge tag 'v3.21.74' of git://git.berlios.de/fldigi

Conflicts:
	src/main.cxx