AdministratorManual/Index.rst: added note to install mysqlnd Driver.
UsersManual/Index.rst: added Form.showButton Support: added findInSet() AbstractBuildForm: added createDeleteUrl(), prepareSubrecord(), getFormTable(). Rewrote buildSubrecord(): added 'delete' link, rearranged 'new' link. 'ShowDebugInfo' enhanced. BuildFormBootstrap: rewrote BuildButton() to switch New/Delete Button on or off. Show debugInfo as tooltip. Constants: New Subrecord contants. formEditor.sql: added Form.showButton. Adjusted records
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