Delay displaying the message until return is pressed.
Also contain all printwarn() calls inside browse().

Fix some mandoc -Tlint warnings as well.

We care about the directory we are going to, so there is no reason
to get locked inside there if the parent is readable.

Often I am waiting for a file to download and be renamed from
.foo.part to .foo.  Forcing a redraw is a simple way to check if
the file has completed downloading.