v4.4.1

A patch: one defect in the ObjectScript classes (re-run initialize_schema() after upgrading to deploy them), and a
source-archive fix. No Python, table or index changes.

Fixed

• In a namespace other than USER, a call into the Arno library left the process in USER: ArnoAccel.KhopSampleJson,
  RandomWalkJson, NeighborAggJson and NKGAccelTraversal.Build2HopExact. Every later native call on that
  connection then read and wrote USER's graph while SQL stayed in the caller's namespace, and Build2HopExact (also
  run by BuildKG and sync()) wrote its two-hop sketch into USER's ^KG. The namespace is now restored after every
  library call, and these entry points, which read USER's globals, refuse elsewhere. Redeploy the classes
  (initialize_schema()).
• tests/tck/features was a symlink to an absolute path, so a GitHub source archive did not extract with Python's
  tarfile data filter, and pip install from it failed. It is relative now. The PyPI sdist was not affected.