Changes .monospace and .proportional in screen.css
Skips ignored contents in node_get_contents and node_set_contents
Makes content type text optional in nodecontenteditor.phtml
Sets label and legend vertical-align to middle in screen.css
Corrects thread_set_node_ignored in thread.inc
Adds thread_get_node_number and thread_get_node_ignored to thread.inc
Merges izend/master