authors, funders, sponsors and contributors are now no
longer converted to respStmts but rather to the appropriate
TEI elements in the titleStmt.

fixes issue TG-1921 for the aggregator: 
TextGrid-MD to TEI mapping is not capturing author etc. in a useful way 
https://develop.sub.uni-goettingen.de/jira/browse/TG-1921

git-svn-id: https://develop.sub.uni-goettingen.de/repos/textgrid/trunk/services/aggregator@13860 7c539038-3410-0410-b1ec-0f2a7bf1c452