Revert "Code refactoring. Improve folder structure. For better project implementation. Most hosting server have a default folder public or public_html insted of htdocs, htdocs is a exclusive folder for apache web server, for example is no the same folder in NGINX."

This reverts commit e91c2c6e.

Code refactoring. Improve folder structure. For better project implementation. Most hosting server have a default folder public or public_html insted of htdocs, htdocs is a exclusive folder for apache web server, for example is no the same folder in NGINX.

data files must be stored outside of documents directory.

API authentication mechanism is supposed to be working with internal or external users

Now we can use tag '@class' into PHPDoc block of method or class.

By example: @class  DolibarrApiAccess {@requires user,external}

One key is stored by user when login API method is called. Each API request must have api_key parameter

Work in progress !