Fixes #7682. 'Input textarea auto height' - Improve detection single/multiple lines, improve doc, enhance unit tests.

Fixes #1201. FE.parameter option has never been implemented. According https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/tabindex only the values '0' and '-1' are good. 'tabindex' has been removed from Manual.rst. FormEditor.sql has been changed that all links are 'tabindex="-1"'.

License.rst: add Twig, PhpSpreadsheet

Nicola Chiapolini authored Jul 17, 2019 and Carsten Rose committed Jul 17, 2019

  * Add Twig Extension to parse QFQ Links
  * Pass assoc-array of query result as context
  * allow to pass template as string

Fixes #8179 - extraButtonLock and extraButtonPassword might be specified without a value or with 0 or with 1.

Refs #8204. Copy requiredPosition from Form to FormElement has been moved from 'formElementSetDefault()' to 'copyAttributesToFormElements()'

F7529 - Guarantee Sip Action plays only once. Update Doc, change from set to '' to removing SIP Key/Value completely.

Replace pdftk by pdfunite. 'pdftk' is outdated. It's hard to install on Ubuntu 18. It fails for recent PDFs. 'pdfunite' is based on poppler. URLs are preserved. Orientation and size are preserved.

Update ReST Syntax URLs. Remove 'extension/Documentation.outdated'. Update .gitignore to not commit rendered doc.