RFR: JDK-8259530: Generated docs contain MIT/GPL-licenced works without reproducing the licence [v2]

[Jonathan Gibbons]

> Please review a change for JavaDoc, for the Standard Doclet to copy legal header files into the generated docs from a default or designated directory.

Jonathan Gibbons has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:

 - Merge remote-tracking branch 'upstream/master' into JDK-8259530
 - use DocFile.copy to install files
 - Merge remote-tracking branch 'upstream/master' into JDK-8259530
 - JDK-8259530: Generated docs contain MIT/GPL-licenced works without reproducing the licence

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3954/files
  - new: https://git.openjdk.java.net/jdk/pull/3954/files/eb4b9d5a..00b62ef6

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3954&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3954&range=00-01

  Stats: 25260 lines in 823 files changed: 9594 ins; 10115 del; 5551 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3954.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3954/head:pull/3954

PR: https://git.openjdk.java.net/jdk/pull/3954