Make applicativeTree aim for safe digits

As previously discussed, this gives the tree more flexibility and
matches what other functions do.
Clean up <*> development artifacts

Some silly remnants of my thought process remained in the code.
Remove them.
Make `-Wall`-clean for base-4.8.0.0
Merge pull request #119 from hvr/pr-base48

Make `-Wall`-clean for base-4.8.0.0
Merge pull request #116 from treeowl/balanceReplicate

Make applicativeTree aim for safe digits
Merge pull request #118 from treeowl/apcleanup

Clean up <*> development artifacts