Add tests for REPLACE.

Author: python-processing-unit

tests/cases/failing/replace-arity-four.pre

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+REPLACE("abc", "a", "b", "c")

tests/cases/failing/replace-arity-one.pre

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+REPLACE("abc")

tests/cases/failing/replace-arity-two.pre

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+REPLACE("abc", "a")

tests/cases/failing/replace-arity-zero.pre

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+REPLACE()

tests/cases/failing/replace-empty.pre

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+REPLACE("abc", "", "x")

tests/cases/failing/replace-first-non-str.pre

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+REPLACE(0d1, "a", "b")

tests/cases/failing/replace-second-non-str.pre

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+REPLACE("abc", 0d1, "b")

tests/cases/failing/replace-third-non-str.pre

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+REPLACE("abc", "a", 0d1)

tests/cases/passing/replace-basic.pre

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+ASSERT(EQ(TYPE(REPLACE("prefix", "fix", "lude")), "STR"))
+ASSERT(EQ(REPLACE("prefix", "fix", "lude"), "prelude"))

tests/cases/passing/replace-empty-new.pre

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+ASSERT(EQ(REPLACE("one,two,three", ",", ""), "onetwothree"))