My first attempt at refolding natural constants led to all names
being printed with their namespace prefixes. This fixes that,
most notably by introducing the massive `mapPTermM` function in
`Idris.Syntax`.
When we check a scope in RigW, need to mark all linear things outside
that scope as irrelevant within the scope (since the scope may be used
multiple times).
This is the result of running the command:
$ find . -name '*.idr' -type f -exec sed -i -E 's/\s+$//' {} +
I confirmed before running it that this would not affect any markdown
formatting in documentation comments.
