reST Documentation: new chapter 'release'. Existing chapters moved from separate directory to main directory. Chapter 'UsersManual' splittet in 'Concept', 'Form', 'Report'

Index.rst: Update Administratormanual how to install and use print.php.
print.php: wrapper for wkhtmltopdf.

Store.php: reading of config.qfq.ini moved to new class Config.php.

BuildFormBootstrap.php: wrap note in class 'qfq-note'

#3180=#2081 dynamicUpdate, rearrange 'input hidden' elements from checkboxes, radios to top of form.

CODING.md: add some doc about STORE_ADDITIONAL_FORM_ELEMENTS.
load.php (#2081): rearrange delivered JSON to fullfill client API.
AbstractBuildForm.php: rename getJsonElementUpdate() to getFormElemenForJson(). Extend getFormElementForJson() to support changes for label and note. Fill store STORE_ADDITIONAL_FORM_ELEMENTS with 'hidden input' elments.
QuickFormQuery.php: implement Client JOSN API update.

*.php: extend explodeParameter(), explodeParameterInArrayElements() with argument $keyName, to make it more generic.

PROTOCOL.md: added 'the attribute' in one sentence

AbstractBuildForm.php, QuickFormQuery.php: documentation updates, code reformat.

Support.php: new function insertAttribute().
AbstractBuildForm.php: added 'id' to all FormElements.
BuildFormBootstrap: extended customWrap to insert 'id' in every wrap element.
QuickFormQuery.php: Add 'id' to Form ToolTip.

FillStoreForm.php, HelperFormElement.php, BuildFormBootstap.php, BuildFormPlain.php, BuildFormTable.php, QuickFormQuery.php: Rename buildFormElementId() to buildFormElementname(). New Function buildFormElementId(). Rename variable $htmlFormElementId to $htmlFormElementName.
Support.php: tooltips now contain an html id.
Constants.php: Preparation for API 'element-update'.

Implemented for Checkbox.

Index.rst, AbstractBuildForm.php: split buildCheckbox() in constructCheckbox(Simple|Multi)Plain() and constructCheckbox(Simple|Multi)Button.

AbstractBuildForm.php, OnArray.php: new function removeEmptyElementsFromArray(). Replace old check of isset() (which seems never have been worked) against ==''.