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 commit consists of patches automatically generated for this project on https://scrutinizer-ci.com

- Bookkeeping ordered by accounting account
- Link with customers and suppliers invoices
- Sub Total by accounting account
- Ability to display more than 25 lines and filter by customer/supplier, invoice and accounting account