gnc_log_init: Be more robust in log file open failure case

[Stephen Evanchik]

This should patch against HEAD and gnucash-gnome2-dev. 

Bug:

If /tmp/gnucash.trace is not accessible by the user then gnucash will
segfault because the fopen in gnc_log_init returned a NULL FILE stream.


Summary of changes:

gnc_log_init will now attempt to open trace files in this order:

/tmp/gnucash.trace

if that fails,

/tmp/gnucash.trace.<PID of gnucash>

and if that fails debug output will go to STDERR. 


Files affected:

src/engine/gnc-trace.c



Stephen Evanchik

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