Misc cleanup
- Replace
catMaybes . map fwithmapMaybe f - Use
concatFSto concatenate multiple FastStrings - Fix documentation of
-exclude-module - Cleanup
getIgnoreCountin GHCi.UI
catMaybes . map f with mapMaybe f
concatFS to concatenate multiple FastStrings-exclude-module
getIgnoreCount in GHCi.UI