Remove the 'DocIdMap' postfix for functions in the DocIdMap module

- DocIdMap should be used with a qualified import
- Linting

Conflicts:
	server/src/Holumbus/Server.hs
Make the analyzer part of the server - not the clients responsibility

- The server was relying on the client to transform the documents
  content into a (word -> [positions]) mapping. This is now part of
  the server
- The ApiDocument has a new structure now, and two flags determine
  if the content is added to the index, to the description or both
- The Fussball2JSON example data is adjusted accordingly