Pull request #74: Dev

Merge in TPSH/ckanext-odsh from dev to master

* commit 'fc950164':
  Revert "adds pkg.accessibility to template package/read"
  Revert "adds layout for accessibility description"
  uses default job queue for tracking
  improves contrast for label "historisch"
  removes label "NEU" for historical datasets, improves accessibility for historical datasets
  closes #130: marks dataset in search result if not latest collection member
  adds meta tag noindex if not latest collection member
  adds layout for accessibility description
  adds pkg.accessibility to template package/read
  adds usecase description for harvester
  fixes bug: recursive setting of mediaType
  uses package name for link from collection member to collection
  fixes bug in html code
  hides all fields except for title if collection is edited
  allows § in tag names
  adds details to catalog in rdf
  uses long version for dcat:mediaType
  changes dataset_dict key used for dct:description to notes
  adds description to odsh_dcat_de_profile