redundant pure virtual functions asking for parameters

[tbrown122387]

seems redundant to have SwarmWithCovs give the implementer two opportunities to make the mistake of breaking the parameterization:

ssme/include/ssme/pswarm_filter.h

Lines 502 to 510 in 4b8eb99

	virtual psv samp_untrans_params() = 0;
	/**
	* @brief instantiate a model with an untransformed parameter
	* at the moment, it is up to the user to make sure that
	* the correct ordering of the parameters is used
	*/
	virtual ModType instantiate_mod(const psv& untrans_params) = 0;