[PATCH] Fix show -c/-q with large entries

[Jö Fahlke]

Hi,

I noticed that for one entry in my pass store `show -c` had stopped working.
Apparently I went a bit overboard with supplemental information in that entry
and now `show -c` was reporting a SIGPIPE since earlier commands in some
internal pipeline were still trying to write while later commands had already
extracted the password line and closed the read end.

Attached are two patches, one that adds some tests to detect this situation,
and one that fixes the actual problem.  Although I saw the problem initially
with `show -c`, the tests are written for `show -q` since that seems easier to
do portably.

Note: tested on Linux only since that's all I have access to.

Thanks for your work,
Jö.

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