Enhance SCOWL database and add lookup utility.

The lookup utility checks if a word will be in one of the generated
speller dictionaries and if not gives hints as to why not if
possible.
Initial version of cgi script to lookup a word in SCOWL.

More specially it checks if a word in in one of the generated speller
dictionaries and if not gives hints as to why not if possible.
Indicate version of SCOWL used in lookup web-app.
Shifted the variants level: 0 => 1, 1 => 2, 2 => 3.
Enhance make-hunspell-dict so that it can create a dictionary from stdin.

Also allow it to run outside of the speller/ directory.  It will still
create all the working files in the current directory.
Added web-app to create customized dictionaries from SCOWL.

This includes the ability to create plain word list.  Most of the
functionality is factored out into a Perl module for easier reuse.
Update web pages to add links to new web-app's in the appropriate places.

Also update the main page to give a better idea of what SCOWL is.