1.6 fixes -- array-map! and srfi-4, and ported guile-readline/ice-9.

[Rob Browning]

Changes to 1.6:

  I backported the 1.7 guile-readline/ice-9/readline.scm migration to
  1.6, so that you can run ./pre-inst-guile, even if your .guile
  includes readline activation.

  I fixed a bug in ramap.c which had allowed array-map! and
  array-map-in-order! calls with no source arrays, i.e. (array-map! a
  proc).  Such calls would cause a segfault.  I'll also copy this to
  1.7 in a bit.

  I fixed a typo in the srfi-4.c code that caused compilation to fail
  on architectures where long requires more than 4 bytes.

-- 
Rob Browning
rlb @defaultvalue.org and @debian.org; previously @cs.utexas.edu
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