Arthur, could you apply the attached patch?

Besides fixing some typos and other editorial changes, there are two substantive changes:

* Extended utf16->string/utf16be->string/utf16le->string to require that
(- end start) be odd, rather than both start and end be odd.

* Changed the default for string-replicate's 'to' argument to
match SRFI-13's xsubstring.

I also added to the Issues possibly renaming string-replicate to xsubstring.

FWIW Today I converted the SRFI-135 testsuite to SRFI-140 (and using the
SRFI-64 style).  There are still lots of failures on Kawa, for procedures
I haven't implemented yet, but a test-suite will help measure progress.
--
	--Per Bothner
xxxxxx@bothner.com   http://per.bothner.com/