osteosarc 0.11.2

• Rebuilding shared test data no longer needs the libraries' own copies
  (#63). The build script's
  --carry openvax-v1 keeps each library's members from the previous bundle, pinned by
  checksum, so the next version builds after a library deletes its test files; a
  --required list replaces all a library had. Fixture targets now record the regions
  they were planned from, so later carries plan them the same way.
• osteosarc test-data treats a published bundle's name as that bundle, even when a
  folder of the same name exists; write ./NAME for the folder.
• The required_*.py scripts take the library revision to read; openvax-v1 means the
  commits openvax-v1 was built from, and reproduces its inputs exactly. A rebuild never
  replaces a published release record.
• The cross-library builder check compares whichever libraries you give it.