bug in ignore plugin + patch to fix

[John Bailey]

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As a list administrator, I received this automatically discarded message from
the list daemon.  I'm forwarding it on here so the appropriate people can look
over it.

I have pre-sanitized the diff by dos2unix'ing it, as there were ^M characters
littered throughout the diff at the insertion points.

John

- --------- Original Message --------
Subject: 	bug+fix ignore.c broken for screen names with spaces in them
Date: 	Thu, 4 Oct 2007 12:06:34 -0400
From: 	Keith Gabryelski <keith at gabryelski.com>
To: 	plugins-devel at lists.guifications.org

the crashes seemed to occur because the preferences lookup routines
couldn't find paths
whose components had spaces in them.

To reproduce:

1) Remove the ignore node from your preferences file.

2) Sign in on AIM with a space in your name, for me I can sign in as
"keith gabryelski" or "keithgabryelski"

3) Open a msg to buddy: "AOL System Msg"

4) type: /ignore +

Notice: messages from AOL System Msg are NOT ignored

5) Now type: /ignore

Notice: *crash* null pointer exception because
purple_prefs_get_string(...) returns NULL in list_ignore_rules().

To solve this, I adjusted the names by using a "+" in place of a space.

There are a few more allocs in the code (with down casing and the
adjustment mentioned -- no idea if the downcasing
was necessary).

I believe I freed as appropriate.

I may have used too large of a hammer.

It works.

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