Clean up the low-level library.
Clean up the low-level library.

- Make sure array.fsi and sstCombinators.fst still go through (even though they
  haven't been cleaned up).

hoheinzollern/FStar,A-Manning/FStar,MallabaevAzamat/FStar,A-Manning/FStar,A-Manning/FStar,FStarLang/FStar,YaccConstructor/FStar,YaccConstructor/FStar,hoheinzollern/FStar,YaccConstructor/FStar,FStarLang/FStar,MallabaevAzamat/FStar,MallabaevAzamat/FStar,MallabaevAzamat/FStar,hoheinzollern/FStar,FStarLang/FStar,hoheinzollern/FStar,YaccConstructor/FStar