v0.7.0

Changed:

• Behavior of workspace generation from URL changes (#149)
  • when cloning from a file:// URL and no directory is given do NOT create
    a temporary directory but reuse the existing directory
  • When not providing mets_basename, assume the last URL path segment to be
    the METS basename instead of the fixed string mets.xml
• incoroporate changes to ocrd_tool schema from spec/v2.2.1