Switch to psr4 composer

See merge request !156

B7903 Delete mit table= als parameter funktioniert nicht mehr.

See merge request !157

B8571 Primary Key: report error if lower/uppercase don't match - in general if...

See merge request !155

F8272 upload save

See merge request !154

B8571 Primary Key: report error if lower/uppercase don't match - in general if given primary key is not found in table definition.

F7529 guarantee get sip action played only once

See merge request !153

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

Variable default: '0' is now treaten as a value. An empty string is still nothing >> no default given.

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 'pdftk' is outdated.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.

Fix undefined index. Refactor functions.sql to function.sql. Inplement constants for Version numbers.

htmlid fixed to not use space, unit tests adapted

See merge request !152

Fix unit tests: replace uniqid() by uniqIdQfq() which delivers a constant id in case of running unit tests

Fix parameter name in documentation (was wrong in one spot).

See merge request !151

Add nice error message with links to skip sql functions update

See merge request !150