Sampler1DRfun should allow non-Dbl Params

[mb706]

The given function could generate any kind of sample, so there is no reason to restrict this to ParamDbl. ParamUty still needs to be kept out because we don't sample data.tables at all for that one. Also this should be tested whether this works for logical, character, integer in combination with other Sampler1Ds in SamplerHierarchical (or if there is some hidden matrix conversion that would break).