Add of $urlwithroot in the setBaseUrls function, to use Dolibarr external domain name in the configuration file

Behind a reverse proxy the basePath seems to be in http.
Forcing the basePath to DOL_MAIN_URL_ROOT fixes the problem.

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.

This is more secure than do the request with sensitive value like password into URL parameters.

This allow to do POST requests from another website.