matt: Massive rewrite of stock_widget_admin.php to bring into line with quality in stock_ticker_admin.php     Edited all code references to use plugin_cache and plugin_utils.      Minor changes to merge identical functionality between stock ticker and stock widget.     stock_widget_display in progress.      Updated category_stocklist storage in the database to uptodate format.

git-svn-id: https://plugins.svn.wordpress.org/custom-stock-widget/trunk@1013688 b8457f37-d9ea-0310-8a92-e5e31aec5664