[AD] word left/right in d_edit_proc()

[Sven Sandberg <ssven.geo@xxxxxxxxxx>]

Hello!
Here's a patch that makes ctrl+leftarrow and
ctrl+rightarrow jump a word left or right in
`d_edit_proc()', just like in most other editors.
(diff also caught some irrelevant tab<-->space
changes, but that's because my editor fixed some
oddities in the original file, so I figured it could
just as well be included.)
Sven

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