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* share/txr/stdlib/copy-file.tl: When removing .. components,
a dotdot must only cancel preceding non-dotdot. We must check
not only that the out stack is not empty but that the top
element isn't dotdot. Also, eliminate empty components, like
the documentation says. Lastly, we must check for the impossible
cases, when the from path uses .. components that are
impossible to navigate backwards to form a relative path.
* tests/018/rel-path.tl: Test cases added.
* txr.1: Updated with additional descriptions, fixes and
examples.
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