Rename SQL upgrade script to released version.
Update changelog for 4.0.0 release and add 4.0.0RC1 release date.
Prepare for 4.0.0 release.
Continue development.
Also install auth/ subdir and genrestapicredentials.

Thanks Glenn Martin for the report.
Mention default admin password in het manual.

Thanks Glenn Martin for reporting.
Remove checks for bisonc++/flexc++ from configure and add their
versions to generated files at time of generation.

Bisonc++/flexc++ are only needed during 'make dist' which should
never need to be run by users installing the system. Also at 'make
dist' we have no configure yet, so we cannot depend on using
etc/config.h for storing version information.
Fix d003189d: create www/auth directory before installing files there.