Added script for batch thumbnail generating

scripts/generate-thumbs.php

@@ -0,0 +1,20 @@
+<?php
+require_once __DIR__ . '/../src/core.php';
+
+Access::disablePrivilegeChecking();
+
+array_shift($argv);
+
+$query = array_shift($argv);
+$posts = PostSearchService::getEntities($query, null, null);
+$entityCount = PostSearchService::getEntityCount($query, null, null);
+$i = 0;
+foreach ($posts as $post)
+{
+	++ $i;
+	printf('%s (%d/%d)' . PHP_EOL, TextHelper::reprPost($post), $i, $entityCount);
+	if (!$post->tryGetWorkingThumbPath())
+		$post->generateThumb();
+}
+
+echo 'Don\'t forget to check access rights.';