- 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)

include/sidebar.php

@@ -33,7 +33,7 @@ function global_sidebar_menu() {
 function app_search_box($q = '')
 {
    global $apidb_root;
-   $str .= '<form method="get" action="'.$apidb_root.'search.php">'."\n";
+   $str = '<form method="get" action="'.$apidb_root.'search.php">'."\n";
    $str .= "<input type=text name=q value='$q' size=8 class=searchfield>";
    $str .= "<input type=submit value='Search' class=searchbutton>\n";
    $str .= "</form>\n";