[PATCH] Startup crash without LOGNAME or HOME environment vars

[Sander M. Kleijwegt]

Dear All,

Subsurface would crash on my Ubuntu 14.04 using my own build of the current
head of master (72806e42bc23ab7c7f2a639a1efee017388b53bc, aug 18). The
culprit was that I had no LOGNAME variable in my environment. Running
subsurface as "LOGNAME='whatever' ./subsurface" was a quick workaround.

Please find attached a trivial patch that checks if there are NULL pointers
returned by getenv, and if so defaults to "~" and/or "default" for the HOME
and LOGNAME variables.

kind regards,
Sander Kleijwegt

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