Remove Data.Monoid newtypes

[jacobstanley]

Any, All, First, Last, Sum, and Product are all useful type/constructor names and it's very rare that I would use the newtype instead of just calling the function of the same name.

The only times that I've ever referred to these things in P is when I have to hide them so I can use the name for one of my own types/constructors.

Have other people found the same thing?

I would like to propose removing them and freeing up the names.

This will be a breaking change that will cause a little bit of churn, for one thing all the places where I have:

import P hiding (All) -- etc

[jacobstanley]

Could be done at the same time as #74 if people agree

[thumphries]

Do we actually use these anywhere? I didn't know they existed. Would be good to estimate the churn before pulling the trigger

[jacobstanley]

Look at the code on my disk the only churn for projects I have would be removing the hiding (XYZ) clauses