bug#7243: [patch] making md5sum's warnings clearer

[Benno Schulenberg]

Hi,

Two years ago I complained about the untranslatability of the warnings
that md5sum prints when it has encountered unexpected things:
http://lists.gnu.org/archive/html/bug-coreutils/2008-09/msg00168.html

Jim asked to come up with a change that doesn't remove information.
I've finally gotten around to making this -- see the attached patch.
In addition to read failures and checksum failures, md5sum now alerts
the user to the number of misformatted checksum lines.  It prints this
line also when '--warn' is not given, because it is so important.

Regards,

Benno

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0001-md5sum-print-a-summary-warning-for-improperly-format.patch
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