* module/rnrs/arithmetic/6/fixnums.scm: Fix missing imports;
(fixnum-width, greatest-fixnum, least-fixnum): Redefine these as
zero-argument procedures; Fix argument mismatches in several functions.
* test-suite/Makefile.am: Add tests/r6rs-arithmetic-fixnums.test to
SCM_TESTS.
* test-suite/tests/r6rs-arithmetic-fixnums.test: New file.
library.
* module/Makefile.am: Add rnrs/arithmetic/6/fixnums.scm and
rnrs/arithmetic/6/flonums.scm to RNRS_SOURCES.
* module/rnrs/6/base.scm: (div-and-mod, div0, mod0, div0-and-mod0): New
functions; this `div' implementation is not quite right, but we'll come
back to it later.
* module/rnrs/arithmetic/6/fixnums.scm: New file.
* module/rnrs/arithmetic/6/flonums.scm: New file.
* test-suite/Makefile.am: Add tests/r6rs-arithmetic-flonums.test to
SCM_TESTS.
* test-suite/tests/r6rs-arithmetic-flonums.test: New file.
