[ticket/12687] Add a constant to display the load time without DEBUG
* Nicofuma/ticket/12687:
[ticket/12687] Remove french spaces
[ticket/12687] Display the number of cached queries
[ticket/12687] Don't check if memory_get_peak_usage() exists
[ticket/12687] Wrap $GLOBALS['starttime'] in a if
[ticket/12687] Fix the namespace of $request
[ticket/12687] Update doc block
[ticket/12687] Use microtime(true)
[ticket/12687] Remove globals
[ticket/12687] Return a string and move the displaying of the sql report
[ticket/12687] Rename DISPLAY_LOAD_TIME to PHPBB_DISPLAY_LOAD_TIME
[ticket/12687] Display the explain link only when DEBUG is set
[ticket/12687] Add a constant to display the load time without DEBUG