suffix functions: ignore trailing slashes.

Another requirements tweak to short-suffix and long-suffix:
ignore one or more trailing slashes, instead of just one.
This harmonizes with base-name, which does same, that
requirement being copies from the POSIX basename utility.

* stream.c (short_suffix, long_suffix): If sl points to a
trailing slash which is the start of a suffix that consists of
nothing but trailing slashes, then we pretend it isn't there.

* tests/018/path.tl: Adjusted two existing test cases, and
added more.

* txr.1: Documented.

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