[Rev 01] RFR: Save references to materialized branches locally

[Robin Westberg]

The pull request has been updated with additional changes.

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Added commits:
 - a8f5474a: All materialize-to-local-ref should force update

Changes:
  - all: https://git.openjdk.java.net/skara/pull/271/files
  - new: https://git.openjdk.java.net/skara/pull/271/files/280c73b8..a8f5474a

Webrevs:
 - full: https://webrevs.openjdk.java.net/skara/271/webrev.01
 - incr: https://webrevs.openjdk.java.net/skara/271/webrev.00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/271.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/271/head:pull/271

PR: https://git.openjdk.java.net/skara/pull/271