New Version naming scheme: <yy>.<mm>.<index> - e.g.: 18.04.1
ext_tables.php: path to icon fixed

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.

AutoCron.php: allow https connections with invalid certificate (e.g. 'localhost' is not listed as a valid hostname).
Manual.rst: Enhance best practice to setup AutoCron.

AutoCron.php: Fix problem with array in checkForOldJobs(). Implement check that re-trigger asynchronous cron jobs are handled correctly.

AutoCron.php: New constants   AUTOCRON_STATUS_OK, AUTOCRON_STATUS_ERROR. Status Length not limited anymore.

Manual.rst: updated to the latest autocron features.

Autocron: implement a) 'output to a file' (content of the retrived page), b) search for a pattern on the output.
Manual.rst: updated to the latest autocron features.

Change getMimeType() in Report in case file is missing or `file` beaks: instead to throw an exception, an empty string is returned.

Bug #5652 / TypeAheadSql: destroyed SQL statement. Fixed broken comparison and missing init of $sqlTest.

Session.php: After setting the QFQ cookie lifetime AND calling setcookie() after session_start(), the QFQ session remains. Also, skipping Session::clearAll() protects against broken SIP after logout!