* C/usage-mail.xml: Fix bugs noted by Dimitrios. Special thanks to him for this patch.
* C/usage-mail-org.xml: especially to filtering section
* C/usage-print.xml: Remove, this is not a useful section.
* C/usage-contacts: spelling
* C/config-prefs.xml: lots of user-suggested corrections here.
* C/Makefile.am: delete printing page and related images.
* Also some places in menuref and so forth.
svn path=/trunk/; revision=24693
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