[gthumb-list] Four minor patches

[Kevin Daughtridge <kevin kdau com>]

Hello. I have been working on some customisations to gthumb (ext branch)
for a client, and have accumulated some fixes for various small issues.
In light of 2.11.1 being imminent, here are my patches.

1. Initialising Clutter through its GOptionGroup instead of using
gtk_clutter_init is cleaner, and it allows the Clutter command line
options to appear in the --help output.

2. If a system does not have xdg-user-dirs installed or fully
configured, gthumb will segfault trying to add the user's Pictures
directory as an entry point. This patch checks the path for NULL first.

3. The viewer_pages code in GthMain was replaced by code in GthBrowser
and is no longer used. This patch removes it.

4. This patch corrects various compiler warnings by adjusting printf and
scanf format strings and by commenting out an unused block from gedit.

Thanks for all your great work on the new 2.11 series!

Attachment: 0001-Initialise-Clutter-through-its-GOptionGroup-instead-.patch
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Attachment: 0002-Do-not-add-user-Pictures-directory-as-an-entry-point.patch
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Attachment: 0003-Remove-unused-viewer_pages-code-from-gth-main-now-in.patch
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Attachment: 0004-Correct-various-compiler-warnings.patch
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