For *nix sustems, recent physics pointcache refactor uses stdio.h's remove() rather then system("rm -f ...") for removing files, since it was a lot slower for removing pointcache.
Ton used the system command because there was some problem using remove() ~6years back, but he cant remember why, (maybe its not a problem now)
Simple error, remove wasn't returning a value, but keep an eye out for problems removing files, and if anyone can reproduce the "Unable to make version backup" problem when saving, we should look into it.
Also added a note about using # in the output path for blenders command line help text.
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