Added multiple bug actions aka "bug action group" in view_all_bug_page.php. Use the scrolling menu at the bottom of the page, previously used for moving bugs.

A function "deletebug" has been created in core_helper_API.php instead of the code in bug_delete.php

Added a direct link, with a small icon, on each bug row, so that users on a selected project can switch directly to the bug_update_advanced_page. Though, if "all project" is selected, it only displays the view_bug_page

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@1147 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9