* srfi-modules.texi (SRFI Support): New file and chapter.
* Makefile.am (guile_TEXINFOS): Added repl-modules.texi and
srfi-modules.texi.
* guile.texi (Top): New menu entries for the new chapters.
(Top): @includes for the new chapters.
(Top): New menu entry for `SRFI Support', @include for
`srfi-modules.texi'.
* repl-modules.texi: New file.
(Readline Support): New chapter for (ice-9 readline).
(Value History): New chapter for (ice-9 history).
