Sip.php, Constants.php: define constant

Delete.php: fixed typo.

.gitignore: added qfq*.zip to ignore. The '*' is important in case the extension are generated with the version number included in the filename.

UsersManual/Index.rst: fixed some typos, replace sanatize class enumeration against table.

Makefile: `make archive` now generates again an extention which can be installed in T3 6.2 and 7.6. The problem was that the zip filename has to be equal to the extension name.

AbstractBuildForm.php, BuildFormBootstrap.php: Implemented alternative button at the bottom of the form.

mockup/second.html: Added standard 'Submit'-button on the bottom of the form. This is an alternative against the regular 'Check'-Button on the top right of the form.

QuickFormQuery.php, FormAction.php: implemented FormElement 'sendmail'
Report.php: Update column 'sendmail'
Sendmail.php: Update class to send mailand to log them in table mailLog.
AbstractBuildForm.php: refacxtured columnname 'value' to be used via constatn FE_VALUE.
formEditor.sql: renamed FE.typ 'sendmail' to camel hook 'sendMail'. Changed FormeElement.mode from 'select' to 'radio'. Added empty table 'mailLog'.

Remove validation messages properly, using bootstrap-validator API

AbstractBuildForm.html: more default configs for the editor. Setting size of the editor.
richttexteditor.html: third RTE to show min/max_height.

Support.php: escapes double ticks with " instead of \" - needed for JSON encoded config strings for TinyMCE.
AbstractBuildForm.php: customize default setup for TinyMCE.