Part of options_init_from_torrc()'s job was looking for -f flags (to specify
an alternate config file) on the command line, complaining if more than one
is given or the given does not exist.  If none is given then use the compiled-in
default location, accepting if it does not exist.  This logic has been moved
into its own function in an attemped to make options_init_from_torrc() easier
to deal with.


svn:r13942