[imp] IMP 3 / IE6 exposed php code

[Liam Hoekenga]

> I'm using IE6, compression on, and can't reproduce it.

It happens consistantly on my home XP machine.

I got it to happen on a fresh install of WinXP on IE6 /after/ I installed 
Netscape 4.98 and 6.21.  I rolled the system back to pre-netscape installation 
state, and it went back to behaving normally.

I have machines I can replicate the problem on, but I'm having a hard time 
determining what differences in their configuation are causing this particular 
problem.

> Except that it doesn't seem to even be specific to IE6, and
> compression is good (tm).

I made a patch to add a new preferences group called "Advanced Options".  It 
does two things right now - allow the user to decide whether IMP should 
compress it's pages, and whether it should display the "Blacklist" UI element 
when filters are enabled.

We don't want to turn page compression off across the board.  A minority of 
users get the ugly piece of exposed code when they use their browser's back 
button, and turning off page compression seems to fix that.  It made sense to 
us, then, to allow those users to turn page compression off to correct their 
problems, while leaving it alone for the rest.

the Blacklist thing?  Our helpdesk thinks people will get confused / upset if 
they see "Blacklist" in the message and mailbox nav bars.  I don't get it, but 
my boss told me to take it out.  Anyways, I figured some people would be able 
to figure it out, and might want the functionality.

My "advanced options" patch can be found at:

    http://www.umich.edu/~liamr/horde/advanced_options.diff

Liam