Added teacher abillity to add/remove students

Updated the user_save to output more meaningful errors
Updates on 'questions' and 'pagetext' tables to change the 0 conference ID to -1, matching the -1 year

user.inc.php

@@ -653,7 +653,6 @@ function user_save(&$u)
 	$fields_for_role['sponsor'] = array('sponsors_id','primary','position');
 	$fields_for_role['teacher'] = array();
 	$fields_for_role['volunteer'] = array('languages');
-
 	/* Merge fields as necessary, build a big list of fields to save */
 	foreach($new_roles as $r) {
 		if(!array_key_exists($r, $fields_for_role)) continue;
@@ -1001,6 +1000,9 @@ function user_add_role(&$u, $role, $password = null){
 		       $_SESSION['roles'][] = $role;
 		}
 
+		// also, update the user:
+		$u = user_load($u['id']);
+
 	}
 	return $result;
 }
@@ -1507,11 +1509,7 @@ function user_invite($username, $password, $email, $roles_id){
 		// all fields have been passed in, let's go ahead and create the account/user/role
 		$newAccount = account_create($username, $password);
 		if(!is_array($newAccount)){
-			switch($newAccount){
-				case -1: $returnval = "Invalid username"; break;
-				case -2: $returnval = "Username already in use"; break;
-				case -3: $returnval = "Invalid password"; break;
-			}
+			$returnval = $newAccount;
 		}
 	}