Improve the graphics toolkit detection code so that properly

identifies situations where its restricted by open_basedir.

We now track more informatoin about the toolkit including the version
and any errors we encountered while doing the detection so that we can
provide more info downstream.  This makes graphics::detect_toolkits()
a little heavier, but that's ok because it should not be called very
often.

In the process, refactor the controller and view hierarchy so that
it's a little more straightforward in the code.

Fixes ticket #616.

modules/gallery/views/admin_graphics_imagemagick.html.php

@@ -1,21 +1,21 @@
 <?php defined("SYSPATH") or die("No direct script access.") ?>
-<div id="imagemagick" class="gBlock<?= $is_active ? " gSelected" : "" ?><?= $tk->imagemagick ? "  gInstalledToolkit" : " gUnavailable" ?>">
+<div id="imagemagick" class="gBlock<?= $is_active ? " gSelected" : "" ?><?= $tk->installed ? "  gInstalledToolkit" : " gUnavailable" ?>">
   <h3> <?= t("ImageMagick") ?> </h3>
   <img class="logo" width="114" height="118" src="<?= url::file("modules/gallery/images/imagemagick.jpg"); ?>" alt="<? t("Visit the ImageMagick project site") ?>" />
   <p>
     <?= t("ImageMagick is a standalone graphics program available on most Linux systems.  Please refer to the <a href=\"%url\">ImageMagick website</a> for more information.",
         array("url" => "http://www.imagemagick.org")) ?>
   </p>
-  <? if ($tk->imagemagick): ?>
+  <? if ($tk->installed): ?>
   <p class="gSuccess">
-    <?= t("ImageMagick is available in %path", array("path" => $tk->imagemagick)) ?>
+    <?= t("ImageMagick version %version is available in %dir", array("version" => $tk->version, "dir" => $tk->dir)) ?>
   </p>
   <p>
     <a class="gButtonLink ui-state-default ui-corner-all"><?= t("Activate ImageMagick") ?></a>
   </p>
-  <? else: ?>
-  <p class="gInfo">
-    <?= t("ImageMagick is not available on your system.") ?>
+  <? elseif ($tk->error): ?>
+  <p class="gWarning">
+    <?= $tk->error ?>
   </p>
   <? endif ?>
 </div>