AGAS: allow for registerid to optionally take ownership of the gid

[brycelelbach]

[reported by hkaiser] [Trac time Thu Aug 11 00:35:12 2011] Currently AGAS binds symbolic names to gids without incrementing the global reference count of those gids. We have scenarios where incrementing the reference count seems to be useful.

[brycelelbach]

[comment by blelbach] [Trac time Thu Aug 11 17:38:15 2011] Didn't realize this was blocking #47.

[brycelelbach]

[comment by hkaiser] [Trac time Sat Sep 17 22:06:10 2011] Actually, this should be the default (see #126).

[brycelelbach]

[comment by blelbach] [Trac time Mon Sep 26 00:03:08 2011] (In #58) 8e186d2.

[brycelelbach]

[comment by blelbach] [Trac time Sun Oct 9 03:45:43 2011] Initial server and addressing_service code done in b410116. Interface done in b43c9f3. Still needs to be tested.

[brycelelbach]

[comment by blelbach] [Trac time Mon Oct 10 00:11:56 2011] Fixes in 34ca334, 05ecde3 and b35ee83. Initial unit tests (#185) added in aa483a3. Further tests are described in #186.