Release 5.19

Due in 14 days (11/04/2020)

Related issues
	bug #9236: stopping an instance breaks the centralized logging
	feature request #7704: Dataportal specimen table should be able to show DerivedUnits without a FieldUnit
	feature request #8413: Abcd import with file containing list of unit ids
	feature request #8490: Sitemap implemented
	feature request #8983: authors and team in combopox better distinguishable
	feature request #9221: New preferences for 'project metadata'
	task #9233: provide feedback mechanism for euro+med

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