Data.Map: move comments from icl to dcl, remove unused code, export keysSet &...

Data.Map: move comments from icl to dcl, remove unused code, export keysSet & fromSet, more efficient gEq
2 jobs for mapCleanup in 3 minutes and 30 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #43970
test-nightly

00:01:24

passed #43971
test-stable

00:02:05