[pass] [feature] tree, detect overflow, use pager

[Jason A. Donenfeld]

There's a nice setting of LESS where you pipe it to less plus the options
that say "don't scroll if it fits in the window entirely", basically making
the less pipe a no-op unless the window is too small.

Here's how systemd does it:
http://git.zx2c4.com/systemd/tree/src/shared/pager.c#n89
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