(ispell-menu-map): Menu items rearranged and

(ispell-menu-map): Menu items rearranged and
converted to the new menu-item format, names silightly changed,
help strings added.

Support for spelling without async subprocesses:

(ispell-cmd-args, ispell-output-buffer)
(ispell-session-buffer): New variables.
(ispell-start-process, ispell-process-status,
ispell-accept-output, ispell-send-string): New functions, for
Ispell invocation when async subprocesses aren't supported.
(ispell-word, ispell-pdict-save, ispell-command-loop,
ispell-process-line, ispell-buffer-local-parsing): Replace calls
to process-send-string with calls to ispell-send-string, and
accept-process-output with ispell-accept-output.
(ispell-init-process): Call ispell-process-status instead of
process-status with.
(ispell-init-process): Call ispell-start-process.  Call
ispell-accept-output and ispell-send-string.  Don't call
process-kill-without-query and kill-process if they are unbound.
(ispell-async-processp): New function.