HelperFormElement.php, SessionCookie.php, Html2Pdf.php, Store.php, Constants.php: migrate to camel case on configuration variables.
Config.php: readConfig() reads now config.qfq.ini and T3 LocalConfiguration.php.

Manual.rst: New check list. Updates on missing config entries. Details for record locking. More precise extraButtonInfo explanation.
config.qfq.example.ini: small updates to explanations.
ext_conf_template.txt: First version of extension manager configuration setup. Not functional.