FCKeditor doesn't escape URLs for whitespaces

[archimedia]

FCKEditor doesn't escape the URL when you insert and image, resulting in a

<img src="http://server/file with spaces.png" />.

Many web clients don't escape the URL for us and, as consequence, get a 404 for the image (like evolution viewing an HTML mail, with images enabled).

Little patch follows.

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Moved from SF:
http://sourceforge.net/tracker/index.php?func=detail&aid=1660425&group_id=75348&atid=543655

[archimedia]

Moved from SF.

[fredck]

Should we escape only spaces? Let's check it.

[fredck]

Fixed with [342].

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