CreateAutomaticDocumentation: make create_full_docu param optional

Also, remove it from the documentation. It (and also the already
undocumented 'entities' argument) are only kept around for
backward compatibility.
Add new magic function GenerateDocumentation
Add makedoc.g demo files for GenerateDocumentation

The included makedoc-PKG.g packages could be used as new
makedoc.g files for indicates packages
PackageInfo.g: Add AutoDoc rec

Specify a custom Copyright and extra includes for CreateMainPage.
Add regenerated title.xml and AutoDoc.xml files

This in particular demonstrates how to use the new function for
packages that do not themselves use AutoDoc.