* module/srfi/srfi-27.scm: New file; implementation of SRFI 27 in terms
of the existing random number generator.
* module/Makefile.am (SRFI_SOURCES): Add srfi/srfi-27.scm.
* test-suite/tests/srfi-27.test: New file; minimal test suite for SRFI 27.
* test-suite/Makefile.am (SCM_TESTS): Add tests/srfi-27.test.
* doc/ref/srfi-modules.texi: Add subsection on SRFI-27 based
on the specification.
