twiggi web-based groupware Code

Database and template class are now abstract.
A new class adodb was introduced that extends the database class.
A new class smarty_tpl was introduced that extends the template class.
Added new options to the config file that are used to the decide which database and template classes to use.
Added start of default template style with test page hello_world.tpl

Function get_root in core class now returns the absolute path.
Added function load_file to core class to load new files (classes) and keeps track of them.
Made a dummy function get_module in core class which is used until the module class is working.
Added function get_debug_mode to core class which return of debugging mode is on.

Main page (index.php) now executes a query (SQL files will be added later) and shows the result on the hello_world template page.