RFR: Initial commit of data plugin [v2]

[Alexandre Iline]

> Initial commit of data coverage JCov plugin. See the readme and tests.

Alexandre Iline has updated the pull request incrementally with one additional commit since the last revision:

  some javadoc
  fixed method filtering
  one more test

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Changes:
  - all: https://git.openjdk.java.net/jcov/pull/16/files
  - new: https://git.openjdk.java.net/jcov/pull/16/files/96be0352..15258e79

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jcov&pr=16&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jcov&pr=16&range=00-01

  Stats: 584 lines in 22 files changed: 543 ins; 2 del; 39 mod
  Patch: https://git.openjdk.java.net/jcov/pull/16.diff
  Fetch: git fetch https://git.openjdk.java.net/jcov pull/16/head:pull/16

PR: https://git.openjdk.java.net/jcov/pull/16