move (test-suite lib) to lower dir; cleans up uninstalled paths.

move (test-suite lib) to lower dir; cleans up uninstalled paths.

* check-guile.in:
* test-suite/Makefile.am:
* test-suite/test-suite/lib.scm:

* benchmark-guile.in:
* benchmark-suite/Makefile.am:
* benchmark-suite/benchmark-suite/lib.scm: Lower the lib modules in the
  source tree.  This lets us remove top_srcdir and top_builddir from the
  uninstalled paths.

* test-suite/tests/asm-to-bytecode.test:
* test-suite/tests/brainfuck.test:
* test-suite/tests/compiler.test:
* test-suite/tests/ftw.test:
* test-suite/tests/gc.test:
* test-suite/tests/match.test:
* test-suite/tests/rnrs-libraries.test:
* test-suite/tests/rnrs-test-a.scm:
* test-suite/tests/sxml.match.test: Adapt to not expect that module
  names be prefixed with "test-suite".