Add k-sample homogeneity & asymptotic ACF IID to `gof.nim`

Add k-sample Anderson-Darling homogeneity test & Sarantsev IID on ACF tests wired into gof.nim helper/demo program. (Must still Bonferroni correct this test suite someday since with so many it's now gotten much too likely that some will just fail by chance.. as with any "suite".)

Also adapt to and update new spfun & retire Q.