Fixes #8853. fe.class=action: container should be hidden - hidden is wrong - FE-action might be assigned to templateGroup Container. New solution: if FE.class='action' only templateGroups are in the 'container' list.

FormAction.php, QuickFormQuery.php: fixed new implemented error - calling 'Evaluate->parse()' with ROW_EXPECT_0_1 returns only an array, not an array of arrays.

F4901: implement split with 'convert' (jpeg). Refactor chmod(), unlink(), rename(), rmdir(), copy() to use by QFQ version which throws an exception.

Feature #6314 - HTML Mode & sendMailSubjectHtmlEntity for Forms. Also fixed some issues with Documentation and implementation.

Store.php, AbstractBuildForm.php, QuickFormQuery.php, Save.php: change signature of appendToStore() to be eqal to setStore().
Unittests for appendToStore.php

SendMail.php: renamed file and class from 'sendmail' to 'sendMail'. Remove obsolete function buildHeader().
AutoCron.php: Update use of class sendMail().
FormAction.php: rename function sendmail(0 to doSendMail().
Report.php: remove unnecessary code. Move sendmailConvertToken() to class sendMail / parseStringToArray().