[Tilesathome] Nicer nice

[Andrew McCarthy]

Hi folks,

Attached is a patch that simplifies how nice is done. Instead of
prefixing all external programs with a call to "nice -n10", it calls
POSIX::nice near where tilesGen.pl starts, and all child processes
inherit its niceness automatically.

It works fine for me here, but I'd appreciate a second pair of eyes, and
also that somebody with Windows can confirm it fails gracefully.

Thanks,

Andrew
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