PATCH: Fix for BR#48679: Proxy options lost after switching proxy use off and on

[Dawit A.]

Please review the first two patches that fix the bug mentioned in the subject.  
They address the core problem outlined in the bug report with the exception 
of the request to automatically select the previous proxy setting when it is 
disabled and then re-enabled again. Though easy enough to fix several ways, 
it is too late at this point.

The last two patches are not really siginficant but something I run into when 
fixing the above bug.  The KProxyDlg one is trivial and might not even be 
necessary.  The KSaveIOConfig one is a bit more significant, but it reduces 
the number of times the same config file have to be read from say the proxy 
config module (it is used by all the config dialogs in the kcontrol/kio 
module).  None of these two are really essential and can wait for post-3.1 if 
there are objections.

Regards,
Dawit A.
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