-- Define the FRONTPATH constant

-- It will be used in TOC_Loader to load the front libraries
1. Add the library path of the store front and library 
path of local into the _ci_library_paths

-- When load libary in the controller, the sytem will search 
the class in current app path, and then in the ci library

-- If the class isn't searched, the libary directory of 
the store front and of local application will be searched 
separately

-- The FRONTPATH constant is pointed to 
../system/tomatocart path

-- The LOCALAPPPAH constant is pointed to admin/local path

-- Both fo them are defined in the admin/index.php

2. Override the _ci_load_class function

-- Support: the local sub-classes extened from toc 
core classed of the admin application

-- Support: the local sub-classes extened from toc core 
classed of the admin application
Update the param comment