Added package description file.
connection: Use with-current-buffer

This is now prefered to using a combination of save-excursion and
set-buffer.
dictionary: Aboid "reference to free variable" warning

The use dictionary-server in dictionary-set-server-var was complained
about.
dictionary: Avoid deprecation warning for process-kill-without-query
dictionary: Use buffer-read-only variable

This fixes a warning about invalid use of interactive function
toggle-read-only.
dictionary: Replace mapcar with mapc where possible

mapc doesn't return the result, mapcar does. So if the result of the
call is not needed, prefer mapc here.
dictionary: Avoid reference to undefined dictionary-server

Add a defvar so that the setter function for defcustom can set the
variable without triggering a warning.