These files implement various useful SRFIs for Guile.  See
http://srfi.schemers.org/.  The bits taken from the Guile source tree
will go away whenever gnucash updates to require a more recent version
of Guile.

Sources of files:

  srfi-1.scm: Guile translation of reference implementation by Olin Shivers.
  srfi-2.scm: Guile source tree (modified for versioning).
  srfi-8.scm: Guile source tree (modified for versioning).
  srfi-9.scm: Guile source tree (modified for versioning).
  srfi-19.scm: Guile source tree (modified for versioning).