v0.10.0

Added

• OpenXmlPackage::removeParts() and removePartsAndRelationships() remove a
  list of parts with one relationship scan instead of one scan per part. Names
  and inbound references are checked before removal; cascading results preserve
  input order and report each equivalent part name once. removeParts() is
  blocked only by a reference from a part the batch keeps, so it accepts what the
  loop of single removals it replaces accepts, whatever the order of the names.
  PackageInterface is unchanged.

Changed

• Breaking. addPartFromPath(), writePartFromPath() and
  setContentsFromPath() no longer copy the file into package-owned storage. The
  file is read when the part is read or the package is saved, so the caller owns
  it until then and must not move, replace, or delete it. The file's identity and
  timestamps are recorded when the part is added and checked on every read, so a
  file changed behind the package's back raises ConcurrentModificationException
  instead of being silently packaged. Pass a stream to keep the old snapshot
  behaviour. getPartReadablePath() returns that file for such a part rather than
  materializing a copy of it; every other staged part is still materialized, since
  only a file the caller owns outlives the staging. Adding a 64 MiB file and saving
  drops from about 87 ms to 66 ms, forty 2 MiB images from about 120 ms to 80 ms,
  and getPartReadablePath() on a 64 MiB part from 18 ms to nothing, because the
  bytes are no longer read to stage them and written again to save them.
• Opening a stream for file-backed staged part contents now uses an independent
  read-only handle to the existing temporary file instead of copying the payload.
  Open readers retain their snapshot across part replacement, removal, moves,
  saves, and package release; the file is cleaned up after its last owner releases it.