Use getnstr() and be done with it.  It will even beep now!

This reverts commit 1e18b85e56.

Revert until remaining issues are fixed.  The filter search expires
after 1 second of inactivity without the revert.

Use 'q' to quit.

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.