Add Boucher's `lalr-scm' as the `(system base lalr)' module.

Add Boucher's `lalr-scm' as the `(system base lalr)' module.

Taken from r51 of <http://lalr-scm.googlecode.com/svn/trunk>.

* module/Makefile.am (SYSTEM_BASE_SOURCES): Add `system/base/lalr.scm'.
  (NOCOMP_SOURCES): Add `system/base/lalr.upstream.scm'.

* module/system/base/lalr.scm, module/system/base/lalr.upstream.scm: New
  files.

* test-suite/Makefile.am (LALR_TESTS, LALR_EXTRA, TESTS,
  TESTS_ENVIRONMENT): New variables.
  (EXTRA_DIST): Add $(LALR_EXTRA).

* test-suite/lalr/common-test.scm,
  test-suite/lalr/glr-test.scm,
  test-suite/lalr/test-glr-associativity.scm,
  test-suite/lalr/test-glr-basics-01.scm,
  test-suite/lalr/test-glr-basics-02.scm,
  test-suite/lalr/test-glr-basics-03.scm,
  test-suite/lalr/test-glr-basics-04.scm,
  test-suite/lalr/test-glr-basics-05.scm,
  test-suite/lalr/test-glr-script-expression.scm,
  test-suite/lalr/test-glr-single-expressions.scm,
  test-suite/lalr/test-lr-associativity-01.scm,
  test-suite/lalr/test-lr-associativity-02.scm,
  test-suite/lalr/test-lr-associativity-03.scm,
  test-suite/lalr/test-lr-associativity-04.scm,
  test-suite/lalr/test-lr-basics-01.scm,
  test-suite/lalr/test-lr-basics-02.scm,
  test-suite/lalr/test-lr-basics-03.scm,
  test-suite/lalr/test-lr-basics-04.scm,
  test-suite/lalr/test-lr-basics-05.scm,
  test-suite/lalr/test-lr-error-recovery-01.scm,
  test-suite/lalr/test-lr-error-recovery-02.scm,
  test-suite/lalr/test-lr-no-clause.scm,
  test-suite/lalr/test-lr-script-expression.scm,
  test-suite/lalr/test-lr-single-expressions.scm: New files.