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differences between expected and actual test output.
* parser.l (yybadtoken): Handle new terminal symbol, SPACE.
New rule for producing SPACE token out of an extent of
tabs and spaces.
* parser.y (SPACE): New terminal symbol.
(o_var): New nonterminal. I noticed that the var rule was
being used for output elements, and the var rule refers to
elem rather than o_elem. A new o_var rule is a simplified
duplicate of var.
(elem): Handle SPACE token. Transform to regex if it is
a single space, otherwise to literal text.
(o_elem): Handle SPACE token in output.
* tests/001/query-2.txr: This query depends on matching
single spaces and so needs to use escapes.
* tests/001/query-4.txr, test/001/query-4.expected: New test
case, based on query-2.txr. It produces the same output,
but is simpler thanks to the new semantics of space.
* txr.1: Documented.
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