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.

AutoCron: Added doc for autocron. Extend AutoCron.php to be MultiDB aware. Update der AutoCron form.

Feature 4720 / Separate Database for Form & FormElement - Multi DB - fixed problem that 'Quick Edit Form / FormElement' has been broken in MultiDB Setup.

Feature #5571 / File Upload: save filesize and mimetype automatically in 'upload mode simple',if those columns exist.

- STORE_VARS contains now 'mimeType' and 'fileSize'.
- sqlBefore and sqlAfter will be fired in Upload Advanced and new in Upload Simple as well.
- STORE_VARS contains now `filenameOnly`. It can be used in downloadButton=....

Feature 5425 / thumbnail: rewrite - secure thumbnails are now rendered on first access, not when 'AS _thumbnail' is called.

Bug #5557 / Form load: STORE_RECORD filled, but should be empty - clear STORE_RECORD in case it's instantiated via QFQ controller.