* arts-2-1-527

* src/xml_io_compound_types.cc (xml_read_from_stream<SpeciesAuxData>):

Throw an error if a tag is defined twice in input file.

* src/absorption.{cc,h} (SpeciesAuxData::ReadFromStream):

Return the name of the current tag.

* src/workspace_ng.{h,cc} (Workspace): Add some debugging code.

git-svn-id: https://www.sat.ltu.se/svn/rt/arts/trunk@8248 aaf1aab0-4228-0410-ad68-8dceda47f409