Don't use TypeRex
Revert "Remove 'tuareg-mode' which is incompatible with TypeRex"

This reverts commit 699c83ea03b667c6155ec281f6201260b59096c3.
Use merlin-mode
Add the path to the ddskk directory to load-path.
Put a large SKK dictionary.
Install 'ddskk' into ./site-lisp.
Add 'skk-autoloads.el' generated by make.