MVC model ,fixed indentation problems

I separated register.php in 2 files: register_restrictions.php,
register_query.php. I included in the sql.php file an if to check if
there is any db connection error. I also fixed some indentation problems
in style.css and other files. Mainly i started fixing the new
corrections from the correction.txt file, and started modifying my file
in order to follow the MVC model.