DICT-LOOKUP is split to support lookups of the word at point and the region.

W3M-DICT-LOOKUP is dumpstered; vocabgrinder will implement practice functionality.
Amend DICT-LOOKUP to add terms to the Vocabgrinder practice table.

Also, automatically execute a network lookup on unknown terms.

I'm sure that'll never get annoying.
Adds a Stump command to invoke Surf.