Fix: Fix some bugs. There still a lot of new bugs to fix (like compatibility through proxy, or restore performance by avoiding huge number of file_exists).

Fix: problem with dol_include_once and dol_require_once (blank page)

Fix: uniformize code

Fix: Fix a lot of regression. There still a lot of new bugs to fix (like compatibility through proxy, or restore performance by avoiding huge number of fil_exists).

Fix: Fix a lot of regression. There still a lot of new bugs to fix (like compatibility through proxy, or restore performance by avoiding huge number of fil_exists).