Disable timeout when in filter or type mode.

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.