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(Anti) Regression tests
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- To build the tests, "markup" must already be compiled in ..
  Do "make" to start the compilation.

- To run the tests:
  ./run

- Program dumpfiles: Do "make dumpfiles" to create it.
  It takes XML file names on the command line, and writes a Latex
  document on stdout. The document shows the contents of all files.
  EXAMPLE:
  $ ./dumpfiles canonxml/data_jclark_valid/ext-sa/*.* >x.tex
  $ latex x