[patch] fix bug 30190 "'bzr cat' requires full path in old revision"

[Cheuksan Edward Wang]

This changeset fixes bug 30190 "'bzr cat' requires full path in old
revision".

``bzr cat`` can look up contents of removed or renamed files. If the
pathname is ambiguous, i.e. the files in the old and new trees have
different id's, the user needs to use "--old" or "--new" to distinguish
between them. If the pathname refers to a single file, the options are
unnecessary.

Cheuksan Edward Wang
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