rewrite tests for cargo compat, decoupled directory, output handling

tests/fixtures/wc/alice_in_wonderland.txt

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+Alice was beginning to get very tired of sitting by
+her sister on the bank, and of having nothing to do: once or twice
+she had peeped into the book her sister was reading, but it had no
+pictures or conversations in it, "and what is the use of a book,"
+thought Alice "without pictures or conversation?"

tests/fixtures/wc/lorem_ipsum.txt

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+Lorem ipsum dolor sit amet, consectetur adipiscing
+elit.  Nunc interdum suscipit sem vel ornare. Proin euismod, justo
+sed mollis dictum, eros urna ultricies augue, eu pharetra mi ex id
+ante. Duis convallis porttitor aliquam. Nunc vitae tincidunt ex.
+Suspendisse iaculis ligula ac diam consectetur lacinia. Donec vel
+velit dui. Etiam fringilla, dolor quis tempor vehicula, lacus
+turpis bibendum velit, et pellentesque elit odio a magna.  Cras
+vulputate tortor non libero vehicula euismod. Aliquam tincidunt
+nisl eget enim cursus, viverra sagittis magna commodo. Cras rhoncus
+egestas leo nec blandit.  Suspendisse potenti. Etiam ullamcorper
+leo vel lacus vestibulum, cursus semper eros efficitur. In hac
+habitasse platea dictumst.  Phasellus scelerisque vehicula
+fringilla.

tests/fixtures/wc/moby_dick.txt

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+Call me Ishmael. Some years ago - never mind how long
+precisely - having little or no money in my purse, and nothing
+particular to interest me on shore, I thought I would sail about a
+little and see the watery part of the world. It is a way I have of
+driving off the spleen and regulating the circulation. Whenever I
+find myself growing grim about the mouth; whenever it is a damp,
+drizzly November in my soul; whenever I find myself involuntarily
+pausing before coffin warehouses, and bringing up the rear of every
+funeral I meet; and especially whenever my hypos get such an upper
+hand of me, that it requires a strong moral principle to prevent me
+from deliberately stepping into the street, and methodically
+knocking people's hats off - then, I account it high time to get to
+sea as soon as I can.  This is my substitute for pistol and ball.
+With a philosophical flourish Cato throws himself upon his sword; I
+quietly take to the ship. There is nothing surprising in this. If
+they but knew it, almost all men in their degree, some time or
+other, cherish very nearly the same feelings towards the ocean with
+me.