getRandSketchingMethod should be called setRandSketchingMethod

[pelesh]

I think this should return the sketching method, not take it as input, no? I.e. this function should be called set

Originally posted by @kswirydo in #86 (comment)

[pelesh]

get/setRandSketchingMethod functions are not implemented. I suggest we remove them from the header files until there is a need to implement them.