- access most globals by their $_XYZ['varname'] name

- fix some code errors and typos (missing $ in front of variable names
and so on)
- fixed a lot of warnings that would have been thrown when error_reporting
is set to show notices (if(isset($variable))) instead of if($variable) for
example)

noteview.php

@@ -33,7 +33,7 @@ if(!$result || mysql_num_rows($result) == 0)
 }
 
 //display admin menu
-if(loggedin() && (havepriv("admin") || $current->ownsApp($appId))) {
+if(loggedin() && (havepriv("admin") || $_SESSION['current']->ownsApp($appId))) {
     apidb_sidebar_add("admin_menu");
 }