Stephen Evanchik's trace crash patch.

[Derek Atkins]

Log Message:
-----------
Stephen Evanchik's trace crash patch.

	* src/engine/gnc-trace.c: Try a few different filenames for
	  the trace log and if all else fails fall back to stderr.

Modified Files:
--------------
    gnucash:
        ChangeLog
    gnucash/src/engine:
        gnc-trace.c