Remove some options from Mail Preferences that aren't worth the screen
real estate they take up. For now, the corresponding GConf keys still
remain and are honored by Evolution. These same options were already
removed for Express mode.
Options removed are:
[ ] Mark messages as read after XXX seconds
[ ] Do not display messages when text size exceeds XXX KB
[ ] Shrink To / Cc / Bcc headers to XXX addresses
[ ] Enable Magic Spacebar
[ ] Enable Search Folders
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